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Volcanic Smog (Vog), Sulfur Dioxide Plumes, and Acidic Ash Protection

លេខអាសន្នខុសគ្នាតាមប្រទេស. ទំព័រនេះប្រើ 911 ដែលជាលេខសម្រាប់សហរដ្ឋអាមេរិក និងកាណាដា។ ប្រទេសជាច្រើនទៀតប្រើលេខ 112, 999 ឬលេខផ្សេងទៀត។ ស្វែងរកលេខសម្រាប់ប្រទេសរបស់អ្នក។.

Volcanic smog (vog), sulfur dioxide (\(SO_2\)) gas plumes, and acidic volcanic ashfall are chronic and acute chemical respiratory hazards produced by degassing and erupting volcanoes that can impact populations 10 to 300+ kilometers (6 to 185+ miles) downwind. When an active volcano vents thousands of metric tons of invisible sulfur dioxide (\(SO_2\)) gas each day, that gas reacts in the atmosphere with sunlight, oxygen, water vapor, and volcanic dust to transform into vog: a dense, hazy aerosol mist composed of microscopic sulfuric acid (\(H_2SO_4\)) droplets and sulfate particles (\(PM_{2.5}\), smaller than 2.5 micrometers). Simultaneously, freshly erupted volcanic ash particles become coated with condensed surface droplets of sulfuric acid (\(H_2SO_4\)), hydrochloric acid (\(HCl\)), and hydrofluoric acid (\(HF\)), turning falling ash and volcanic rain into a corrosive chemical hazard with a \(\text{pH}\) between \(2.0\) and \(4.0\).

According to the United States Geological Survey (USGS), the International Volcanic Health Hazard Network (IVHHN), the World Health Organization (WHO), and the Hawaii State Department of Health, sulfur dioxide and acidic vog trigger life-threatening reflex bronchospasm in people with asthma or COPD at concentrations as low as \(0.5\text{ to }5\text{ parts per million (ppm)}\). In addition, acidic ash and volcanic acid rain rapidly leach toxic fluoride and dissolved lead (from roof flashings and solder joints) into household rainwater catchment cisterns. While heavier-than-air crater-floor asphyxiant gases like carbon dioxide (\(CO_2\)) are covered in our limnic eruptions and volcanic gas clouds guide, this guide provides the complete respiratory, eye, water-supply, and shelter-in-place protocols for surviving downwind \(SO_2\) plumes, vog episodes, and acidic ash.

Standard N95 / P100 Dust Masks Do NOT Stop Sulfur Dioxide (SO2) Gas Molecules

A critical mistake made by residents and tourists near active volcanic vents (such as Kīlauea and Mauna Loa in Hawaii, Iceland's Reykjanes Peninsula, Masaya in Nicaragua, Popocatépetl in Mexico, Sakurajima in Japan, or Mount Etna in Italy) is relying on a paper N95, KN95, FFP2, or P100 particulate dust mask inside a strong sulfur dioxide (\(SO_2\)) gas plume. - What an N95 / P100 mask stops: It traps solid volcanic ash particles and liquid vog sulfate aerosol droplets (\(PM_{2.5}\)). - What passes straight through an N95 / P100 mask: Pure sulfur dioxide (\(SO_2\)) gas molecules are thousands of times smaller than the pores of any particulate filter and pass straight through an N95 into your lungs, forming corrosive sulfurous acid on your wet bronchial airways. To block \(SO_2\) gas near a volcanic vent, you must wear an elastomeric half-face or full-face respirator fitted with NIOSH-approved Acid Gas (AG / Yellow- or Magenta-Olive band) chemical cartridges, or in an unexpected emergency, breathe through a cloth soaked in baking soda (sodium bicarbonate) solution while evacuating crosswind.

ធ្វើដូចនេះឥឡូវនេះ

  1. Evacuate crosswind (perpendicular to the wind) or shelter indoors immediately if you smell a sharp "struck match" or burnt fireworks odor (\(SO_2\) gas) or see thick blue-gray vog haze. Sulfur dioxide becomes detectable by smell at \(0.5\text{ to }3\text{ ppm}\) and becomes Immediately Dangerous to Life or Health (IDLH) at \(100\text{ ppm}\). If you are outdoors near a volcanic plume, move uphill and crosswind, stop all physical exercise (heavy breathing pulls corrosive \(SO_2\) bypass straight past the nose into the deep lungs), and get inside a tightly closed building or vehicle.
  2. Seal your indoor "Clean Air Room," set Air Conditioning to RECIRCULATE, and scrub indoor acid gases using a HEPA + Activated Carbon purifier or a Baking Soda fan screen. Close all windows, doors, and fireplace dampers, and tape shut bathroom/kitchen exhaust vents and window A/C fresh-air intakes. If you do not have an air purifier equipped with a heavy activated carbon / potassium permanganate acid-gas bed, mix 2 tablespoons (\(30\text{ grams}\)) of household baking soda (sodium bicarbonate) into 1 liter (\(1\text{ quart}\)) of water, soak a thin cotton bedsheet or dish towel in the alkaline solution until damp, and hang it directly across the intake grill of an indoor box fan to chemically neutralize indoor \(SO_2\) and acid mist.
  3. Keep prescribed asthma rescue inhalers (albuterol/salbutamol) and preventive corticosteroid inhalers in your pocket at all times. People with asthma, reactive airway disease, COPD, chronic bronchitis, heart disease, infants, and pregnant women are hypersensitive to \(SO_2\): concentrations of just \(0.5\text{ to }1.0\text{ ppm}\) cause the smooth muscles surrounding the bronchial tubes to clamp shut within 2 to 5 minutes. If wheezing, chest tightness, or persistent coughing does not resolve after two puffs of a rescue inhaler, call your local emergency number (911 in the United States and Canada, 112 across the European Union, 999 in the United Kingdom, or see all លេខសង្គ្រោះបន្ទាន់); see our asthma attack first aid guide.
  4. Disconnect your rooftop rainwater catchment downspouts BEFORE the volcanic ash or acid plume arrives. Volcanic acid rain (\(\text{pH } 2.5\text{ to }4.0\)) and acidic ash coating your roof will wash toxic hydrofluoric acid (fluoride) into your drinking-water cistern while simultaneously dissolving toxic lead, copper, and zinc out of metal roofing nails, lead roof flashings, and gutter solder into your tap water. Pull the downspout diverter pipe off your cistern tank immediately before the plume hits, and check tank \(\text{pH}\) (must be neutralized with baking soda to \(\text{pH } 6.5\text{ to }8.5\)) after the eruption.
  5. NEVER rub stinging eyes or run dry windshield wipers during acidic ashfall, flush eyes with water for 15 minutes. Acidic volcanic ash is not soft fireplace soot: it consists of microscopic, jagged shards of shattered silicate rock and volcanic glass coated in sulfuric and hydrochloric acid. Rubbing your eyes grinds razor-sharp glass splinters into your cornea, and running dry windshield wipers scratches car windshields permanently opaque in seconds. Remove contact lenses immediately, wear non-vented wrap-around goggles, and flush burning eyes with a gentle stream of sterile saline or clean water for 15 minutes; see eye injuries first aid.
  6. Wash acidic ash off garden vegetables, pasture troughs, and pets' paws, and never let livestock graze on ash-dusted grass. Fluoride (\(HF\)) condensed onto fine volcanic ash causes fatal acute fluorosis and hypocalcemia in grazing sheep, cattle, goats, and horses that lick or eat ash-coated pasture grass. Bring pets and livestock under cover, feed clean stored hay/feed, and cover open water troughs.

Volcanic smog (vog), sulfur dioxide (\(SO_2\)), and acidic ash decision tree

Use this field and household decision flowchart to select the right respiratory filter, indoor shelter setup, and water-safety response.

flowchart TD
    Start["Volcanic Plume Hazard Downwind:<br/>Sulfur Dioxide (SO2) Gas, Hazy Vog Aerosol, or Acidic Ashfall"] --> PlumeType{"Which volcanic hazard is<br/>affecting your location?"}

    PlumeType -->|"1. NEAR VENT / FISSURE (<15 km):<br/>Invisible Choking SO2 Gas Plume<br/>('Struck Match' Smell, SO2 > 1 to 10+ ppm)"| NearSO2["ACUTE SULFUR DIOXIDE (SO2) GAS PROTOCOL:<br/>1. WARNING: N95 / P100 dust masks DO NOT block SO2 gas<br/>2. Put on Acid Gas (AG) Cartridge + P100 Elastomeric Respirator<br/>   OR breathe through cloth soaked in Baking Soda + Water<br/>3. Move IMMEDIATELY Crosswind & Uphill (do not run/exert)<br/>4. Drive out of plume with Car A/C on RECIRCULATE"]

    PlumeType -->|"2. DOWNWIND REGIONAL HAZE (15 to 300+ km):<br/>Sulfuric Acid Vog Aerosol (PM2.5) + Low SO2"| DownwindVog["REGIONAL VOG & ASTHMA PROTECTION:<br/>1. Wear N95 / KN95 / FFP2 mask outdoors (blocks PM2.5 acid droplets)<br/>2. Indoors: Close windows, set A/C to Recirculate, & run HEPA + Carbon<br/>   air purifier (or Box Fan with damp Baking-Soda sheet)<br/>3. Keep Albuterol rescue inhaler in hand; stay hydrated with warm fluids"]

    PlumeType -->|"3. FALLING ACIDIC VOLCANIC ASH & ACID RAIN<br/>(Gritty Glass Shards Coated in H2SO4, HCl, & HF)"| AcidAsh["ACIDIC ASH & WATER CATCHMENT PROTECTION:<br/>1. Disconnect rooftop rainwater downspouts from cistern tank NOW<br/>2. Wear N95/P100 mask + Non-Vented Eye Goggles + Long Sleeves<br/>3. Remove contact lenses; NEVER rub eyes (glass shards scratch cornea)<br/>4. Bring livestock/pets indoors & cover open water troughs"]

    NearSO2 --> MedCheck{"Are any emergency medical<br/>symptoms developing?"}
    DownwindVog --> MedCheck
    AcidAsh --> MedCheck

    MedCheck -->|"Severe Wheezing, Chest Tightness,<br/>Stridor, or Unrelieved Coughing"| AsthmaER["ACUTE BRONCHOSPASM / AIRWAY BURN:<br/>1. Sit casualty upright (never lie flat)<br/>2. Administer 2 to 4 puffs Albuterol inhaler (via spacer if available)<br/>3. Call 911 / 112 / 999 & monitor 24 to 48 hrs for Pulmonary Edema"]

    MedCheck -->|"Ash or Acid Rain in Eyes"| EyeFlush["CORNEAL GLASS & ACID FLUSH:<br/>Hold eyelids open and pour clean water / saline across eye<br/>for 15 minutes WITHOUT rubbing"]

Comparing Near-Vent \(SO_2\) Plumes vs. Downwind Vog vs. Acidic Volcanic Ash

Understanding how a volcanic plume transforms chemically as it blows downwind explains why the protective mask that works \(50\text{ kilometers}\) (\(30\text{ miles}\)) away fails completely at \(3\text{ kilometers}\) (\(2\text{ miles}\)) from the vent.

Plume Phase & Distance from Volcano Primary Chemical Composition Particle / Molecule Size What It Looks and Smells Like Required Mask / Respirator Protection
1. Near-Vent Sulfur Dioxide (\(SO_2\)) Plume (0 to 15 km / 0 to 10 miles from crater or fissure) Unreacted gaseous Sulfur Dioxide (\(SO_2\)), plus gaseous Hydrogen Chloride (\(HCl\)) and Hydrogen Fluoride (\(HF\)). ម៉ូលេគុលឧស្ម័នបុគ្គល (\(\sim 0.0004\text{ micrometers}\)) ឆ្លងកាត់តាមសរសៃក្រដាស/ក្រណាត់។ Colorless or faint bluish-white gas near the vent; intense, sharp, choking "struck match" or burnt fireworks smell that stings the nostrils and throat immediately. NIOSH-approved Acid Gas (AG) Chemical Cartridge + P100 Particulate Filter on a tight rubber half-face or full-face respirator. (Emergency field substitute: cloth soaked in baking soda + water). N95 masks DO NOT stop \(SO_2\) gas.
2. Downwind Volcanic Smog ("Vog") (15 to 300+ km / 10 to 185+ miles downwind, or trapped on leeward coast) Atmospheric oxidation converts \(SO_2\) gas over 4 to 24 hours into liquid Sulfuric Acid (\(H_2SO_4\)) aerosol droplets and solid Ammonium Sulfate (\([NH_4]_2SO_4\)) particles, mixed with residual \(SO_2\) gas. Fine particulate matter (\(PM_{2.5}\)): \(0.1\text{ to }2.5\text{ micrometers}\) in diameter, small enough to reach deep lung alveoli. Thick, murky gray-white or brownish-blue haze that obscures mountains and turns sunsets blood-red; faint acidic taste or odorless. N95 / KN95 / FFP2 / P100 particulate respirator captures 95% to 99.9% of the liquid sulfuric acid and sulfate aerosol particles (\(PM_{2.5}\)); adding an activated-carbon layer helps absorb trace residual \(SO_2\).
3. Acidic Volcanic Ashfall (0 to 500+ km downwind of explosive eruptions) Pulverized silicate rock and volcanic glass shards (\(SiO_2\)) coated on the outside with condensed sulfuric acid (\(H_2SO_4\)), hydrochloric acid (\(HCl\)), and hydrofluoric acid (\(HF\)) salts. Coarse ash (\(60\text{ to }2,000\text{ }\mu\text{m}\)), fine inhalable ash (\(<10\text{ }\mu\text{m}\), \(PM_{10}\)), and respirable ash (\(<4\text{ }\mu\text{m}\), \(PM_{2.5}\)). Dark gray or black gritty fall of abrasive rock dust accompanied by an acrid sulfur smell and stinging acid rain droplets. N95 / FFP2 / P100 particulate respirator + sealed non-vented eye goggles (never wear contact lenses).

Official \(SO_2\) Air Quality Index (AQI) and USGS / Hawaii DOH Action Thresholds

In volcanic regions like Hawaii, Iceland (Icelandic Meteorological Office Loftgæði thresholds), Japan (JMA near Mount Aso and Sakurajima), and Italy, air quality monitoring stations report 15-minute and 1-hour Sulfur Dioxide (\(SO_2\)) concentrations in parts per million (ppm) alongside \(PM_{2.5}\) Vog levels:

Advisory Level & Color Code 15-Minute Average \(SO_2\) Concentration (ppm) Sensitive Groups (Asthma, COPD, Children, Seniors, Heart Disease) General Healthy Population
1. Green: Good \(0.00\text{ to }0.10\text{ ppm}\) (\(0\text{ to }100\text{ ppb}\)) Normal outdoor activities safe; carry rescue inhaler as usual. Normal outdoor activities safe.
2. Yellow: Moderate \(0.11\text{ to }0.20\text{ ppm}\) (\(110\text{ to }200\text{ ppb}\)) Mild airway irritation possible during heavy exercise; reduce prolonged outdoor exertion if coughing starts. No health effects expected.
3. Orange: Unhealthy for Sensitive Groups \(0.21\text{ to }1.00\text{ ppm}\) High risk of acute asthma bronchospasm within 5 to 15 minutes: Stay indoors in a sealed, air-conditioned or carbon-filtered room; avoid all outdoor exercise. Mild throat tickle or eye stinging possible; limit heavy outdoor workouts.
4. Red: Unhealthy \(1.01\text{ to }3.00\text{ ppm}\) Severe danger: Evacuate crosswind out of the plume if possible, or seal indoor safe room immediately and keep rescue inhaler ready. Noticeable burnt-match odor, coughing, throat burning, and stinging eyes; everyone should move indoors and stop outdoor exertion.
5. Purple: Very Unhealthy \(3.01\text{ to }5.00\text{ ppm}\) Life-threatening bronchospasm: Immediate evacuation from plume area required. Everyone experiences immediate airway irritation, chest tightness, and coughing; stay indoors with acid-gas filtration or evacuate crosswind.
6. Maroon: Hazardous / Emergency Greater than \(5.00\text{ ppm}\) (NIOSH IDLH is \(100\text{ ppm}\)) Acute medical emergency: Immediate evacuation required; wear Acid Gas cartridge respirator during escape. Hazardous to all humans: Risk of chemical bronchitis, laryngospasm, and delayed pulmonary edema; evacuate immediately with Acid Gas respirator or baking-soda wet cloth.

Deep dive 1: How to build an indoor "Acid-Gas Scrubbing Safe Room" when trapped in a Vog or \(SO_2\) plume

If a wind shift blows a thick volcanic \(SO_2\) or vog plume over your town (for example, during Hawaii's "Kona wind" episodes when southerly winds blow Kīlauea's plume across the entire island chains, or when winds blow Reykjanes volcanic plumes directly over Grindavík and Reykjavík in Iceland) and you cannot immediately evacuate, ordinary indoor air quickly equalizes with outdoor gas unless you actively seal and scrub a room:

  1. Choose and Seal One Interior Room:
  2. ជ្រើសរើសបន្ទប់គេង ឬបន្ទប់ទឹកខាងក្នុងដែលមានបង្អួចតិចបំផុត និងការជ្រៀតចូលជញ្ជាំងផ្នែកខាងក្រៅ។
  3. បិទ​បង្អួច​ទាំងអស់​ហើយ​ចាក់សោ​វា​ឱ្យ​តឹង (​ការ​ចាក់សោ​សោ​វា​នឹង​បង្រួម​រន្ធ​កៅស៊ូ​ដែល​មាន​ខ្យល់ចេញចូល​) ។
  4. ប្រើ ** កាសែត ឬ បំពង់ទុយោរបស់វិចិត្រករ និងបន្ទះប្លាស្ទិក ** ដើម្បីបិទជុំវិញស៊ុមបង្អួចម៉ាស៊ីនត្រជាក់ កង្ហារផ្សែងពិដានបន្ទប់ទឹក ក្រណាត់ផ្ទះបាយ និងរន្ធម៉ាស៊ីនសម្ងួតសម្ងួតសម្លៀកបំពាក់ ហើយចុចកន្សែងរមៀលសើមប្រឆាំងនឹងស្នាមប្រេះបាតទ្វារ។
  5. ** កំណត់រចនាសម្ព័ន្ធម៉ាស៊ីនត្រជាក់របស់អ្នកឱ្យបានត្រឹមត្រូវ **៖
  6. ប្រសិនបើអ្នកមានប្រព័ន្ធ HVAC កណ្តាល ឬប្រព័ន្ធ A/C ដែលគ្មានបំពង់បំបែក (mini-split): វាមានសុវត្ថិភាព និងមានប្រយោជន៍ក្នុងការដំណើរការវា ** ដោយសារប្រព័ន្ធបំបែកគ្រាន់តែចរាចរខ្យល់ក្នុងផ្ទះឡើងវិញ** និងធ្វើឱ្យបន្ទប់បាត់បង់សំណើម (សំណើម condenses aerosols អាស៊ីតមួយចំនួនទៅលើ coil evaporator សើម ហើយបង្ហូរវានៅខាងក្រៅ)។
  7. ប្រសិនបើអ្នកមាន ម៉ាស៊ីនត្រជាក់តាមបង្អួច ឬ ម៉ាស៊ីន A/C បំពង់តែមួយដែលអាចចល័តបាន៖ ប្តូរដងថ្លឹងខ្យល់មេកានិកទៅជា "បិទ / RECIRCULATE" (មិនដែល "ខ្យល់ស្រស់/បើក") ហើយ **កុំដំណើរការម៉ាស៊ីនត្រជាក់ដែលមានទុយោតែមួយ ក្នុងអំឡុងពេលមានឧស្ម័នចេញ ** (ឯកតាបង្អួចបំពង់តែមួយ បូមខ្យល់ចេញក្រៅផ្ទះរបស់អ្នក បង្កើតសម្ពាធខ្យល់ចេញក្រៅផ្ទះរបស់អ្នក។ ឧស្ម័ន \(SO_2\) ចូលតាមរាល់ការបំបែកជញ្ជាំង)។
  8. ** ដំណើរការម៉ាស៊ីនសម្អាតខ្យល់អាស៊ីត (ពាណិជ្ជកម្មធៀបនឹងវិធីសាស្ត្រ DIY Baking Soda) **៖
  9. ជម្រើសពាណិជ្ជកម្ម៖ តម្រង HEPA ស្ដង់ដារតែឯងអាចចាប់ភាគល្អិតរឹង និងរាវ vog (\(PM_{2.5}\)) ** ប៉ុន្តែមិនជាប់ឧស្ម័ន \(SO_2\)**។ ដើម្បីយកឧស្ម័ន \(SO_2\) ចេញពីក្នុងផ្ទះ ឧបករណ៍បន្សុតខ្យល់របស់អ្នកត្រូវតែមានគ្រែ Granular Activated Carbon (GAC) ធ្ងន់ (\(1\text{ to }5+\text{kg}\) of carbon), impregnated with potassium permanganate, sodium bicarbonate, or potassium iodide (chemisorption media)។
  10. Field-Proven DIY Baking Soda Box-Fan Scrubber (IVHHN / USGS Protocol)៖
    • ដោយសារស្ពាន់ធ័រឌីអុកស៊ីត (\(SO_2\)) អាស៊ីតស៊ុលហ្វួរីក (\(H_2SO_4\)) និងអាស៊ីត hydrochloric (\(HCl\)) ជាអាស៊ីតខ្លាំង ពួកវាត្រូវបានបន្សាបយ៉ាងឆាប់រហ័សដោយ មូលដ្ឋានអាល់កាឡាំង ដូចជា សូដាដុតនំគ្រួសារ (សូដ្យូមប៊ីកាបូណាត \(NaHCO_3\)) ឬ សូដាលាង$2_កាបូន* សូដ្យូម។ $\(SO_2 + 2NaHCO_3 \rightarrow Na_2SO_3 + H_2O + 2CO_2\)$
    • រំលាយ **2 ទៅ 3 ស្លាបព្រាបាយ (\(30\text{ to}45\text{g}\)) នៃ baking soda ក្នុង 1 លីត្រ (\(1\text{ quart}\)) នៃទឹកក្តៅ ** នៅខាងក្នុងដបបាញ់ ឬចាន។
    • ត្រាំស្រោមខ្នើយកប្បាសស្តើង ក្រណាត់ជ័រ ឬកន្សែងមីក្រូហ្វាយបឺរក្នុងទឹក baking soda រុំវាចេញដើម្បីឱ្យវាសើម (មិនស្រក់លើខ្សែអគ្គិសនី) ហើយរុំវា ឬខ្ទាស់វាកាត់ ** គម្របខាងមុខនៃកង្ហារប្រអប់អគ្គិសនីស្តង់ដារ ** (រក្សាក្រណាត់ឱ្យឆ្ងាយពីរន្ធម៉ូទ័រខាងក្រោយ)។
    • សើមឡើងវិញហើយបាញ់ក្រណាត់ជាមួយនឹងដំណោះស្រាយសូដារៀងរាល់ 30 ទៅ 60 នាទីនៅពេលដែលកង្ហារផ្លុំខ្យល់នៅក្នុងបន្ទប់តាមរយៈសរសៃអាល់កាឡាំង។

ហេតុអ្វីបានជាអ្នកមិនត្រូវពាក់ Contact Lenses អំឡុងពេលភ្នំភ្លើងភ្នំភ្លើង ឬ Acid Vog

គ្រូពេទ្យឯកទេសភ្នែក និងបណ្តាញគ្រោះថ្នាក់សុខភាពភ្នំភ្លើងអន្តរជាតិ (IVHHN) ចេញការហាមឃាត់យ៉ាងតឹងរ៉ឹងលើការពាក់ កែវភ្នែកទន់ ឬរឹង គ្រប់ទីកន្លែងនៅជិតផេះភ្នំភ្លើង ឬទឹកអាស៊ីតក្រាស់៖ 1. ការកិនកញ្ចក់កញ្ចក់៖ បំណែកផេះភ្នំភ្លើងមីក្រូទស្សន៍ (\(2\text{ to }20\text{ micrometers}\)) រអិលនៅក្រោមគែមនៃកញ្ចក់ទំនាក់ទំនង ហើយជាប់រវាងកញ្ចក់ប្លាស្ទិក និងកញ្ចក់ភ្នែករបស់អ្នក។ រាល់ពេលដែលអ្នកព្រិចភ្នែក កែវថតធ្វើសកម្មភាពដូចជាក្រដាសខ្សាច់ កិនកញ្ចក់ភ្នំភ្លើងដែលខ្ទេចខ្ទីពេញភ្នែករបស់អ្នក ហើយបណ្តាលឱ្យមានការឈឺចាប់ ការបាក់ឆ្អឹង និងដំបៅ។ 2. ការស្រូបអាស៊ីតចូលទៅក្នុង Soft Hydrogel Lenses៖ កែវភ្នែកទន់ត្រូវបានផលិតឡើងពីសារធាតុប៉ូលីម៊ែរអ៊ីដ្រូជែលស្រូបយកទឹក ដែលដើរតួដូចអេប៉ុង ស្រូបខ្យល់ អាស៊ីតស៊ុលហ្វួរីក (\(H_2SO_4\)) និងស៊ុលហ្វួឌីអុកស៊ីត (\(SO_2\)) ចេញពីផ្លុំ ហើយសង្កត់អាស៊ីតប្រមូលផ្តុំដោយផ្ទាល់ទៅលើផ្ទៃភ្នែករបស់អ្នកជាច្រើនម៉ោង។ ត្រូវពាក់វ៉ែនតាសុវត្ថិភាពតាមវេជ្ជបញ្ជាជានិច្ច ឬវ៉ែនតាសុវត្ថិភាពដែលមិនមានខ្យល់ចេញចូលក្នុងអំឡុងពេលព្រឹត្តិការណ៍ភ្នំភ្លើង។

ការជ្រមុជទឹកជ្រៅ 2៖ ការពារអាងស្តុកទឹកទឹកភ្លៀងនៅលើដំបូលពីទឹកអាស៊ីត Hydrofluoric (\(HF\)) និងការលេចធ្លាយសំណ

នៅក្នុងកោះភ្នំភ្លើង និងសហគមន៍ជនបទជាច្រើននៅទូទាំងពិភពលោក (រួមទាំងស្រុក Puna និង Kaʻū នៃកោះ Hawaii, Vanuatu, Montserrat, កោះ Canary និងជនបទនៅអាមេរិកកណ្តាល/ឥណ្ឌូនេស៊ី) ផ្ទះរាប់ម៉ឺនខ្នងមិនភ្ជាប់ទៅនឹងបំពង់ទឹកក្រុង និងពឹងផ្អែក 100 ភាគរយលើ ដំបូលផ្ទះ ទឹកភ្លៀង ការប្រមូលផល និងទឹកសម្រាប់ផឹក។

បន្ទុះភ្នំភ្លើងបំពុលអណ្តូងទឹកភ្លៀងនៅលើដំបូលតាម ផ្លូវគីមីគ្រោះថ្នាក់ពីរ៖

ផ្លូវទី 1៖ អាស៊ីតផ្ទាល់ និងហ្វ្លុយអូរីត (\(HF\)) / ការចម្លងរោគស៊ុលហ្វាត

នៅពេលដែលភ្លៀងភ្នំភ្លើងធ្លាក់តាមរយៈផ្លុំ \(SO_2 / HCl / HF\) ឬនៅពេលដែលទឹកភ្លៀងលាងផេះភ្នំភ្លើងដែលមានជាតិអាស៊ីតដែលធ្លាក់មកថ្មីៗចេញពីដែក ឬដំបូលប្រក់ស័ង្កសីរបស់អ្នកចូលទៅក្នុងលូ ទឹកដែលចូលក្នុងធុងទឹករបស់អ្នកធ្លាក់ចុះទៅជាអាស៊ីត \(\text{pH}\) នៃ \(2.8\text{ ដល់ }4.5\) ទៅ (ទឹកខ្មេះ)។ - សូម្បីតែស្រទាប់ស្តើង \(1\text{-millimeter}\) នៃផេះភ្នំភ្លើងដែលលាងចេញពីដំបូលក៏អាចបោះចោលកម្រិតដ៏គ្រោះថ្នាក់នៃសារធាតុរលាយ ហ្វ្លុយអូរី (\(F^-\)) ទៅក្នុងធុង ដែលបណ្តាលឱ្យចង្អោរ រមួលក្រពើ និងគ្រោងឆ្អឹង/ធ្មេញ (ឬការថយចុះជាតិស្ករក្នុងឈាមធ្ងន់ធ្ងរនៅក្នុងបសុសត្វ និងសត្វចិញ្ចឹម)។

ផ្លូវទី 2៖ ការលេចធ្លាយអាស៊ីតនៃលោហធាតុធ្ងន់ (សំណ ទង់ដែង ស័ង្កសី អាសេនិច) ពីដំបូល និងបំពង់ទឹករបស់អ្នក

មុនពេលមានលេខកូដអគារគ្មានការនាំមុខទំនើប ផ្ទះចាស់ៗជាច្រើនបានប្រើ ** ដែកគោលដំបូលនាំមុខ ** ** បំពង់ផ្សែង / បំពង់ខ្យល់ចេញចូល ** ** ថ្នាំលាបដែលមានជាតិសំណ / ថ្នាំ primers នៅលើដំបូលស័ង្កសី ** ឬ ** សំណប៉ាហាំងសំណប៉ាហាំង ** នៅលើបំពង់ស្ពាន់ផ្ទះ។ - ទឹកភ្លៀងអព្យាក្រឹតធម្មតា (\(\text{pH } 5.6\text{ ដល់ }7.0\)) ស្ទើរតែមិនរំលាយសំណរឹង។ - ទោះជាយ៉ាងណាក៏ដោយ នៅពេលដែលភ្លៀងដែលមានជាតិអាស៊ីត (\(\text{pH } 3.0\text{ ដល់ }4.5\)) អង្គុយលើដំបូលផ្ទះ ឬឈរពេញមួយយប់នៅក្នុងបំពង់ទឹកក្នុងផ្ទះ វានឹងរលាយសារធាតុពុល និងទង់ដែងចូលទៅក្នុងទឹកផឹកយ៉ាងខ្លាំង។ ការស្ទង់មតិដោយនាយកដ្ឋានសុខភាពកោះហាវ៉ៃ និង USGS នៅជុំវិញទីក្រុង Kīlauea បានរកឃើញថា ក្នុងអំឡុងពេល 2% កើនឡើងដល់ 4% ** ប្រព័ន្ធទប់ទឹកភ្លៀងបានលើសពីដែនកំណត់អតិបរមានៃសារធាតុកខ្វក់របស់ EPA របស់សហរដ្ឋអាមេរិកសម្រាប់សំណ (\(15\text{ parts per billion}\))** ដែលបង្កហានិភ័យដល់ការអភិវឌ្ឍន៍ប្រព័ន្ធប្រសាទយ៉ាងធ្ងន់ធ្ងរដល់ទារក និងកុមារ។

បញ្ជីត្រួតពិនិត្យការការពារ និងអព្យាក្រឹតទឹកភ្លៀង 5 ជំហាន

  • ជំហានទី 1 (មុនពេល Plume/Ash មកដល់)៖ រាងកាយ ផ្តាច់បំពង់បង្ហូរទឹកស្អុយ (ឬត្រឡប់សន្ទះបិទបើកទឹកដំបូងរបស់អ្នក) ដូច្នេះគ្មានការហូរចេញពីដំបូលអាចចូលទៅក្នុងធុងផ្ទុករបស់អ្នកក្នុងអំឡុងពេលផ្ទុះ ឬខ្យល់ព្យុះ។ បិទបាំងរន្ធខ្យល់ខាងលើ ឬអេក្រង់សំណាញ់នៅលើធុងទឹកដោយបន្ទះប្លាស្ទិកធ្ងន់ ដើម្បីកុំឱ្យផេះខ្យល់បក់ចូលទៅក្នុងទឹក។
  • ** ជំហានទី 2 (After Ashfall Ends)៖ បោស ឬប៉ែលស្ងួតផេះភ្នំភ្លើងចេញពីដំបូលជាមុនសិន (ពាក់របាំងមុខ N95/P100 វ៉ែនតា និងខ្សែការពារធ្លាក់ប្រសិនបើនៅលើដំបូល) បន្ទាប់មកទុយោចុះពីលើដំបូល និងប្រឡាយជាមួយនឹងទឹកដែលមិនផឹករហូតដល់ទឹកហូរចុះ ដើម្បីភ្ជាប់ធុងទឹកឡើងវិញ**។
  • ជំហានទី 3 (Test Tank Water \(\text{pH}\))៖ ប្រើអាងហែលទឹក ឬអាងចិញ្ចឹមត្រីដែលមានតំលៃថោក \(\text{pH}\) ឧបករណ៍ធ្វើតេស្ត ឬឌីជីថល \(\text{pH}\) ម៉ែត្រ ដើម្បីពិនិត្យមើលទឹកនៅក្នុងធុងអាងរបស់អ្នក។ ទឹកក្នុងផ្ទះដែលមានសុវត្ថិភាពគួរតែមាន \(\text{pH}\) ចន្លោះ \(6.5\text{ និង }8.5\)។
  • ជំហានទី 4 (បន្សាបអាស៊ីតទឹកក្នុងអាងជាមួយ Baking Soda)៖ ប្រសិនបើទឹកធុងរបស់អ្នកមានជាតិអាស៊ីត (\(\text{pH}\) ក្រោម \(6.0\)) ពីភ្លៀងធ្លាក់ខ្លាំង (មិន* ផេះខ្លាំងៗទេ ប្រសិនបើផេះហ្វ្លុយអូរីច្រើនលាងចូលក្នុងធុង សូមកុំផឹកវាដោយមិនបានធ្វើតេស្តមន្ទីរពិសោធន៍) អ្នកអាចបន្សាបជាតិអាស៊ីតរបស់ស្តេចដោយបញ្ឈប់ការរំលាយជាតិអាស៊ីត និងបញ្ឈប់ការរំលាយជាតិអាស៊ីត។ (សូដ្យូមប៊ីកាបូណាត \(NaHCO_3\))** ចូលទៅក្នុងធុងក្នុងកម្រិតចាប់ផ្តើមប្រហែល \(50\text{ to }100\text{g}\) (\(2\text{ to }3.5\text{ ounces}\) ឬ \(\sim 3\text{ to }6\text{ tablespoons}\)) ក្នុងមួយ \(0\texts (10\)) ហ្គាឡុង}$) នៃទឹក ធ្វើចរាចរទឹក ហើយសាកល្បងម្តងទៀតនូវ \(\text{pH}\) រហូតដល់វាឡើងដល់ \(7.0\text{ ទៅ }7.5\) (ឬដំឡើងតម្រង calcite [calcium carbonate] acid-neutralizing filter)។
  • ជំហានទី 5 (លាងទឹកម៉ាស៊ីនពេលព្រឹក)៖ នៅក្នុងផ្ទះណាដែលមានខ្យល់ចេញចូល ទុកឱ្យ faucet ផ្ទះបាយត្រជាក់រយៈពេល 60 ទៅ 120 វិនាទីរៀងរាល់ព្រឹក** មុនពេលស្រង់ទឹកសម្រាប់ផឹក ឬកាហ្វេ (បង្ហូរចេញទឹកដែលជាប់គាំងស្រូបលោហធាតុនៅខាងក្នុងបំពង់ផ្ទះពេញមួយយប់) ហើយប្រើ ** NSF/ANSI Standard Standard 5* filter 5.

សម្អាតផេះភ្នំភ្លើងដែលមានជាតិអាស៊ីតនៅជុំវិញផ្ទះ និងយានជំនិះរបស់អ្នកដោយមិនបំផ្លាញសួត ឬម៉ាស៊ីន

  1. ** ធ្វើឱ្យផេះភ្នំភ្លើងសើមបន្តិចម្ដងៗដោយប្រើទឹកបាញ់មុនពេលបោស ឬបោះចោលនៅកម្រិតដី**៖ ការបោសសម្អាតស្ងួតបញ្ចេញនូវភាគល្អិតកញ្ចក់ដែលអាចដកដង្ហើមបានល្អ (\(PM_{2.5}\) និង \(PM_{10}\)) ត្រង់ចូលទៅក្នុងតំបន់ដកដង្ហើមរបស់អ្នក។ បញ្ចេញផេះកម្រិតដីស្រាលៗដោយប្រើបំពង់ទុយោសួនច្បារ មុនពេលបោះវាចូលទៅក្នុងថង់ប្លាស្ទិកដែលធន់ធ្ងន់ (** ករណីលើកលែង៖ មិនត្រូវត្រាំផេះក្រាស់នៅលើដំបូលផ្ទះឡើយ** ពីព្រោះផេះភ្នំភ្លើងសើមមានទម្ងន់ \(1,500\text{ ទៅ }2,000\text{ គីឡូក្រាមក្នុងមួយម៉ែត្រគូប}\) [\(2,000 ក្នុងមួយម៉ែត្រគូប}\) [\(2,000 ក្នុងមួយម៉ែត្រគូប] cubic yard}\)] ហើយដួលរលំដំបូល ការណែនាំអំពីភ្នំភ្លើង)
  2. បន្សាបផេះអាស៊ីតនៅលើថ្នាំលាបរថយន្ត បន្ទះស្រូបពន្លឺព្រះអាទិត្យ និងដែក HVAC condensers ៖ ដោយសារផេះដែលមានជាតិអាស៊ីតធ្វើឱ្យសំបករថយន្ត ខូច ព្រុយម៉ាស៊ីនត្រជាក់អាលុយមីញ៉ូម និងរារាំងបន្ទះស្រូបពន្លឺព្រះអាទិត្យ កុំជូតផេះស្ងួតចេញពីឡាន ឬបន្ទះស្រូបពន្លឺព្រះអាទិត្យដោយប្រើក្រមា (0-grit) ដូចទៅនឹងខ្សាច់ដែរ។ ជំនួសមកវិញ យកសំបកចេញជាមួយនឹងទឹកសម្ពាធទាបដែលមានបរិមាណខ្ពស់ជាមុនសិន លាងជាមួយនឹងដំណោះស្រាយសាប៊ូរថយន្តស្រាលៗ លាយជាមួយម្សៅ baking soda 2ស្លាបព្រាបាយក្នុងមួយធុងទឹក ដើម្បីបន្សាបស្រទាប់អាស៊ីតស៊ុលហ្វួរី/អ៊ីដ្រូក្លរិច ហើយលាងជម្រះ។
  3. ** ប្តូរតម្រងខ្យល់ម៉ាស៊ីនរថយន្ត និងតម្រងខ្យល់ក្នុងកាប៊ីនឱ្យបានញឹកញាប់**៖ ធូលីកញ្ចក់ភ្នំភ្លើងល្អិតល្អន់បានបឺតចូលទៅក្នុងម៉ាស៊ីនចំហេះខាងក្នុងដើរតួជាសមាសធាតុបិទភ្ជាប់ដែលបំផ្លាញចិញ្ចៀនពីស្តុង និងម៉ាស៊ីន turbochargers ក្នុងចម្ងាយគីឡូម៉ែត្រ។

កសិកម្ម សត្វពាហនៈ និងការការពារ fluorosis គ្លីនិកកំឡុងពេលមានផេះអាស៊ីត

នៅពេលដែលការផ្ទុះផ្ទុះដាក់ប្រាក់សូម្បីតែ \(1\text{ to }5\text{ millimeters}\) (\(0.04\text{ to }0.2\text{ inches}\)) នៃផេះភ្នំភ្លើងល្អនៅលើវាលស្មៅកសិកម្ម សួនច្បារ និងសួនផ្កា ការគំរាមកំហែងគីមីចម្បងចំពោះសុវត្ថិភាពចំណីអាហារ និងជីវិតសត្វគឺ ** ហ្វ្លុយអូរី $$ អំបិល Fluoride (Fluoride $\(H\)2) និង \(NaF\), \(AlF_3\))** ស្រូបយកទៅផ្នែកខាងក្រៅនៃគ្រាប់ផេះមីក្រូទស្សន៍៖

  1. Why Grazing Sheep, Cattle, and Horses Die of Acute Fluorosis Within 24 to 72 Hours:
  2. Ruminants (sheep, goats, dairy and beef cattle, deer) and horses graze close to the soil line and inevitably swallow \(100\text{ to }500+\text{ grams}\) of ash per day along with coated blades of grass and soil.
  3. Inside the acidic stomach (abomasum), the hydrofluoric acid coatings dissolve rapidly into the bloodstream. Fluoride ions (\(F^-\)) aggressively bind to circulating calcium (\(Ca^{2+}\)) and magnesium (\(Mg^{2+}\)) ions in the animal's blood, precipitating insoluble calcium fluoride and causing catastrophic acute hypocalcemia (paralysis of skeletal and cardiac muscle), metabolic collapse, seizures, and sudden death.
  4. Mandatory Livestock Protocol: Move all grazing livestock into roofed barns, sheds, or small sacrificial dirt paddocks immediately when ashfall begins; cover open stock-watering troughs with tarps; and feed only uncontaminated baled hay, silage, or bagged grain until at least \(25\text{ to }50\text{ millimeters}\) (\(1\text{ to }2\text{ inches}\)) of clean rainfall has washed the fluoride ash off pasture blades into the soil.
  5. Home Vegetable Gardens and Fruit Trees:
  6. Acidic ash (\(H_2SO_4\) and \(HCl\)) causes brown chemical "acid burn" spots on leafy greens (lettuce, spinach, cabbage, kale, herbs) and lodges inside leaf folds.
  7. Discard outer leaves of cabbage/lettuce exposed to heavy acidic ashfall, and wash all smooth-skinned fruits and root vegetables thoroughly in clean water mixed with 1 teaspoon of baking soda per liter, followed by a clean potable water rinse, before eating.

សំណួរដែលគេសួរញឹកញាប់

Why doesn't a standard N95 or P100 dust mask protect you from Sulfur Dioxide (SO2) gas near a volcanic vent?

N95, KN95, FFP2, and P100 masks are particulate filters designed to trap solid dust grains and microscopic liquid droplets (like volcanic ash and downwind sulfuric acid vog aerosols) that are roughly 0.1 to 10 micrometers wide. Pure sulfur dioxide (SO2) emitted near a volcanic crater or fissure is a true gas whose individual molecules are roughly 0.0004 micrometers across, nearly a thousand times smaller than the tiniest particles an N95 is rated to catch. Those gas molecules pass right through the open fiber weave of an N95 mask without resistance. To block gaseous SO2, you must wear an elastomeric respirator equipped with chemical Acid Gas (AG) cartridges filled with treated activated carbon/alkaline sorbent, or breathe through a cloth soaked in baking soda and water while evacuating.

What is the difference between volcanic "Vog" and coastal volcanic "Laze"?

Vog (volcanic smog) forms anywhere an active volcano vents sulfur dioxide (SO2) gas into the sky: as the plume drifts downwind over hours to days, sunlight, oxygen, and atmospheric moisture react with the SO2 to create a widespread regional haze of fine sulfuric acid (H2SO4) and sulfate aerosol particles (PM2.5). Laze (lava haze), by contrast, is a localized, brilliant-white coastal plume that forms only where red-hot molten lava pours directly into ocean seawater: the extreme heat boils and splits sea salts (magnesium and sodium chloride) into concentrated hydrochloric acid (HCl) mist (pH 1.5 to 2.0) mixed with needle-sharp fragments of shattered volcanic glass.

How does volcanic smog (vog) or acid rain cause lead poisoning in household drinking water?

In regions where homes collect rainwater from their roofs into storage cisterns, sulfur dioxide and acid aerosols from volcanic plumes dissolve into raindrops and settle onto roof surfaces, turning the collected rainwater acidic (often pH 3.0 to 4.5). When this acidic water runs over lead roof flashings, lead-headed roofing nails, certain galvanized roof coatings, or sits inside household plumbing pipes joined with older lead-tin solder, the acid chemically dissolves toxic lead and copper straight into the drinking water. Disconnecting downspouts during plumes, neutralizing cistern water to pH 7.0 with food-grade baking soda or calcite filters, and using an NSF-53 lead-certified tap filter prevents exposure.

Why do my eyes burn so badly in volcanic ash or vog, and why is rubbing them so dangerous?

Volcanic plumes attack the eyes with a combination of chemical acid and physical glass. First, sulfur dioxide gas and sulfuric acid vog droplets dissolve into the tear film of your eyes to form weak sulfurous and sulfuric acid, causing an immediate stinging and burning reflex. Second, volcanic ash consists of microscopic, razor-sharp splinters of shattered silicate glass. If you rub your stinging eyes with your fingers, or if you are wearing contact lenses that trap ash grains against your eyeball, you physically grind those microscopic glass shards into the surface of your cornea, causing severe corneal abrasions. Always remove contact lenses, wear sealed goggles, and flush burning eyes by pouring clean water or sterile saline for 15 minutes without rubbing.

ប្រភពបានពិនិត្យ

  • United States Geological Survey (USGS) Volcano Hazards Program and Hawaiian Volcano Observatory (HVO): Volcanic Smog (Vog), Sulfur Dioxide (\(SO_2\)) Gas Plume Dispersion, and Acidic Volcanic Ash Chemical Leachate Studies.
  • International Volcanic Health Hazard Network (IVHHN), World Health Organization (WHO), and Durham University: The Health Hazards of Volcanic Ash: A Guide for the Public, Guidelines on Protection from Volcanic Gases and Acid Rain, and Respirator Selection Matrices.
  • Hawaii State Department of Health (DOH) and University of Hawaii at Mānoa College of Tropical Agriculture and Human Resources (CTAHR): Short-Term Sulfur Dioxide (\(SO_2\)) Color-Coded Air Quality Advisory Thresholds and Guidelines for Rainwater Catchment Systems in Volcanic Vog and Ash Zones.
  • Centers for Disease Control and Prevention (CDC / NIOSH, United States): NIOSH Pocket Guide to Chemical Hazards: Sulfur Dioxide (\(SO_2\)), Sulfuric Acid (\(H_2SO_4\)), and Hydrogen Fluoride (\(HF\)) Respirator Cartridge Standards.
  • Icelandic Meteorological Office (IMO / Veðurstofa Íslands) and Directorate of Health (Embætti landlæknis): Volcanic Gas Pollution (\(SO_2\) and \(H_2S\)) Public Response Tables and Indoor Shelter-in-Place Protocols.

ការណែនាំដែលពាក់ព័ន្ធ