Volcanic Ashfall in the Philippines: Which Mask to Wear, Whether to Drive, How to Protect Your Air Conditioner and Car, and How to Clean Up

Ash starts falling: get in, close up, seal the gaps

The order is: people and pets indoors, doors and windows shut, gaps sealed, anything that draws outside air switched off, and water stored.

A greying sky, a film of fine powder on cars and pavement, and a smell of sulphur are the signals to go in. Anyone caught outside should cover nose and mouth with a mask or damp cloth and enter the nearest building. Bring pets inside and cover their water.

Close every door and window, and block the gaps under doors, around frames and at vents with damp towels or tape. Switch off the kitchen extractor, bathroom exhaust fans and any ventilation unit that pulls air from outdoors. Bring in laundry and cover open buckets and tanks.

While pressure is normal, fill some containers with clean water. Heavy ash in reservoirs and treatment plants can turn tap water cloudy or lead to rationing. If the water looks cloudy or smells odd, do not drink it; use bottled water until the supplier says quality has recovered.

Charge phones and power banks. Damp ash conducts electricity, and when it settles on insulators and substation equipment it can trip the supply. Backup power is discussed in what to do during a Philippine brownout.

Follow the volcano bulletins of the national volcanology agency and notices from city hall and the barangay. Ashfall alone does not normally call for evacuation. If you live inside a designated danger zone around the volcano, or a local evacuation notice is issued, leave as instructed; see what to do when you receive an evacuation order. How much ash you get depends on distance and on the wind that day, so districts of the same city can differ widely.

Choosing a mask and eye protection, and who needs extra care

The first choice is a particulate respirator that seals to the face, such as an N95 or equivalent. An ordinary surgical mask stops only part of the ash, and a cloth mask or damp towel is for when there is nothing else. The brand matters less than the seal.

On masks: press the nose clip down firmly and check that air does not escape around the edges when you breathe out. Facial hair breaks the seal. Adult sizes do not fit children's faces well, so keep children indoors rather than rely on a mask. Replace a mask that is damp, dirty or hard to breathe through. Indoors, with windows closed and no visible dust, there is no need to wear one all the time.

Eyes: ash particles have sharp edges, and rubbing them in can scratch the cornea. Wear sealed goggles or close-fitting safety glasses outdoors. Contact lens wearers should switch to spectacles, because particles trapped under a lens cause injury. If ash gets in the eye, flush with plenty of clean water and do not rub. Persistent pain, light sensitivity or blurred vision needs a doctor.

Skin: wear long sleeves and trousers, shake clothing off at the door and shower when you come in. Some ash is acidic and may irritate.

People who need particular care are those with asthma, chronic obstructive lung disease or heart disease, infants and young children, older people and pregnant women. They should stay in as far as possible, keep enough regular medication and inhalers at hand, and see a doctor early if wheezing, chest tightness or coughing worsens. Where to seek care is covered in the guide to healthcare and medical insurance in the Philippines.

For a healthy adult, brief exposure to light ash usually means a dry throat, a cough and sore eyes that ease once away from it. That is not a licence to work or sweep in it unprotected for long periods.

Air conditioners, electronics and the roof: what to protect at home

A split-type air conditioner can keep running for cooling, but the outdoor unit needs protection. Anything that draws in outside air should be off. Ash on the roof is the structural risk people most often overlook.

Air conditioning: the indoor unit of a household split system does not pull air from outside, so with windows shut it can be used, and it makes keeping the windows closed bearable in the heat. The outdoor unit is another matter, since ash clogs and abrades its fins. In heavy ashfall, switch off and cover the outdoor unit with cloth. In light ashfall you may keep it running and clean the filters and fins afterwards. For window units and any system with a fresh-air intake, close the intake or stop using it. Wash filters more often than usual during and after the event.

Electronics: cooling fans pull ash into computers, routers and televisions. Cover what you are not using with cloth or plastic. Clean with a vacuum or a slightly damp cloth, never a dry cloth on screens and lenses, which will scratch.

Roof and gutters: dry ash is already heavy, and after rain the weight rises markedly. Light steel or sheet-metal roofing and old trusses may not cope, and gutters and downpipes block and pond. A visibly thick layer has to be removed, but do not climb onto the roof yourself during ashfall or after rain. Wet ash is extremely slippery and falls are a recurring cause of injury and death in ash events. Have experienced workers do it with safety lines once the ash has stopped.

Cover water tanks, open pools and water features. Ash on garden plants and leafy vegetables can be rinsed off and the produce eaten after thorough washing.

In a condominium, the common roof and central systems are the management's job. Ask the administration office whether the fresh-air system has been shut.

Whether to drive, and how to protect a vehicle

Avoid driving while ash is falling. If you must, go slowly, use headlights, leave a long gap, and never run the wipers on a dry windscreen. Ash harms a vehicle in three ways: visibility, grip and engine air intake.

On the road, visibility can drop very quickly, and moving traffic throws settled ash back into the air. The layer makes the surface slippery, and rain turns it into a slick mud that lengthens braking distance. Road markings disappear. Drive at low speed, brake early and avoid sharp steering. Motorcycles and bicycles are far more exposed and are best left parked.

Windscreen: running the wipers on dry glass drags the particles across it and scratches it. Rinse with plenty of water first, then use washer fluid. Set the cabin ventilation to recirculate and close the outside air intake.

Engine: the air filter clogs fast. A vehicle driven through ashfall should have its air filter checked and replaced early, and the oil and oil filter may need changing ahead of schedule. Follow the vehicle manual and the workshop's findings.

Parking: use a garage if you have one. Outdoors, cover the car with a car cover or cloth, at the very least the windscreen and the air intake area. When washing the body, flood it with water first and do not wipe dry, or the paint will be scoured. Do not flush the ash into the storm drain.

Public transport and ride-hailing may run reduced services or stop in heavy ashfall, so confirm before setting out. Whether ash damage to a vehicle is insured depends on whether the policy includes the relevant natural perils extension; see how car insurance works in the Philippines.

How class, work and flight suspensions are decided

Class suspensions are announced by local government or the school, and flight suspensions by the aviation authority and airport operator. Neither is determined by how much ash you can see.

Classes: a mayor or governor may suspend classes across a jurisdiction because of ashfall, and schools may decide on their own. The news comes through the city's official account, school notices and the media. A suspension is not a day out; children should stay inside. How lost teaching time is recovered is covered in how make-up classes are arranged after suspensions.

Work: for private businesses, suspension is generally the employer's decision in light of government advice and actual conditions, while suspension in government offices is announced by the relevant authority. Employers should weigh the safety of the commute, and employees should describe conditions in their area honestly to their manager.

Flights: ash damages aircraft engines, so airspace and airports may close after an eruption even where ash on the ground is light or invisible, and they may reopen and close again. Do not go to the airport without confirmation from the airline. Rebooking and refunds follow the airline's announcement; the general approach to force majeure cancellations in the typhoon refund and rebooking guide applies in much the same way.

If a visa expires in this period, a cancelled flight does not automatically waive an overstay. Keep the cancellation notice and deal with the immigration office promptly, in the order set out in what to do when your flight is cancelled on the day your visa expires.

If you had planned a trip around a volcano, adjust it to the bulletins. Stay out of the permanent danger zone, and do not move closer in order to watch an eruption.

Cleaning up once the ash stops, and what Yixing can help with

The principles are: wait until the ash has stopped, dampen lightly to hold the dust down, bag it, and keep it out of the drains.

Put on a mask, goggles, gloves and long sleeves before you start. Wet the ash gently with a sprayer or hose so it does not billow, but do not soak it, because saturated ash becomes a heavy sludge that blocks drainage. Collect it with a shovel and broom into strong bags. Local governments usually announce how ash will be collected; put the bags where instructed, keep them separate from household rubbish, and never tip ash into a canal or storm drain.

Indoors, work from top to bottom: vacuum or wipe furniture with a slightly damp cloth, then deal with the floor. Vacuum bags and filters clog quickly and need frequent changing. Leave shoes and outer clothing at the door.

Roof cleaning is for professionals, once the ash has stopped and the surface is dry. Afterwards, check that gutters, downpipes and floor drains run freely. Inspect and replace air-conditioner filters, vehicle air filters and water purifier cartridges in one round at the end.

Keep children from playing on ash-covered ground during cleanup, and keep anyone with a respiratory condition out of the sweeping.

Photograph property damage before cleaning. If you hold home insurance, notify the insurer promptly; the evidence routine matches the claim process for typhoon damage.

Yixing is a private consultancy registered in the Philippines (SEC Registration No. CS202009551; BI Accreditation No. CA-202624381-1, valid to 2027-06-30; also accredited by DOLE and PRA). It is not part of any government office and offers neither cleanup nor medical services. During volcanic activity, what we can assist with is visa extensions and explanations when flights are grounded, and sorting out everyday matters of living in the Philippines. See settling-in support. For health concerns see a doctor, and for safety follow official bulletins.