HEPA versus ioniser?+
Ionisers can produce ozone and mainly make particles settle. HEPA physically removes them.
Purifier versus opening windows?+
Ventilation helps when outdoor air is clean. On polluted days it makes indoor air worse.
Purifier versus plants?+
Plants are lovely but remove a negligible amount of pollution at household scale.
Do I still need a vacuum?+
Yes. Filtration handles airborne particles, not settled dust.
What's the best approach for PM2.5?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the PM2.5 load.
What's the best approach for PM10?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the PM10 load.
What's the best approach for ultrafine 0.3-micron particles?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the ultrafine 0.3-micron particles load.
What's the best approach for construction dust?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the construction dust load.
What's the best approach for road dust?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the road dust load.
What's the best approach for house dust?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the house dust load.
What's the best approach for dust-mite debris?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the dust-mite debris load.
What's the best approach for pollen?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the pollen load.
What's the best approach for mould spores?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the mould spores load.
What's the best approach for pet dander?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the pet dander load.
What's the best approach for pet hair?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the pet hair load.
What's the best approach for cooking smoke?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the cooking smoke load.
What's the best approach for deep-fry odours?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the deep-fry odours load.
What's the best approach for tadka smoke?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the tadka smoke load.
What's the best approach for incense smoke?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the incense smoke load.
What's the best approach for mosquito-coil smoke?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the mosquito-coil smoke load.
What's the best approach for candle soot?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the candle soot load.
What's the best approach for cigarette smoke?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the cigarette smoke load.
What's the best approach for vehicle exhaust?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the vehicle exhaust load.
What's the best approach for diesel soot?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the diesel soot load.
What's the best approach for industrial haze?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the industrial haze load.
What's the best approach for stubble-burning smoke?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the stubble-burning smoke load.
What's the best approach for firecracker smoke?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the firecracker smoke load.
What's the best approach for paint fumes?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the paint fumes load.
What's the best approach for new-furniture off-gassing?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the new-furniture off-gassing load.
What's the best approach for formaldehyde?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the formaldehyde load.
What's the best approach for cleaning-product fumes?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the cleaning-product fumes load.
What's the best approach for damp musty odours?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the damp musty odours load.
What's the best approach for garbage odours?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the garbage odours load.
What's the best approach for airborne droplets?+
Remove or control the source first, ventilate when outdoor air allows, and run HEPA filtration continuously to handle the rest of the airborne droplets load.
Filtration or ventilation while sleeping?+
While sleeping, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation while working from home?+
While working from home, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation during online classes?+
During online classes, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation while cooking?+
While cooking, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation just after cooking?+
Just after cooking, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation during a party?+
During a party, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation while painting a room?+
While painting a room, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation during renovation?+
During renovation, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation in monsoon humidity?+
In monsoon humidity, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation during Diwali week?+
During Diwali week, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation during winter smog?+
During winter smog, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation on a high-AQI day?+
On a high-AQI day, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation when windows must stay open?+
When windows must stay open, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation in a ground-floor flat on a main road?+
In a ground-floor flat on a main road, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation in a top-floor flat?+
In a top-floor flat, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation in an old building?+
In an old building, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation in a newly built flat?+
In a newly built flat, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation with a pet cat?+
With a pet cat, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation with a pet dog?+
With a pet dog, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation with two pets?+
With two pets, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation with a newborn at home?+
With a newborn at home, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation with elderly parents at home?+
With elderly parents at home, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation in a shared flat?+
In a shared flat, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation in a PG room?+
In a PG room, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation while moving between homes?+
While moving between homes, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation during a house move?+
During a house move, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation in a smoking household?+
In a smoking household, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation near a construction site?+
Near a construction site, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation near a busy junction?+
Near a busy junction, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation near a garbage point?+
Near a garbage point, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation during pollen season?+
During pollen season, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
Filtration or ventilation during a dust storm?+
During a dust storm, filtration is usually the safer choice; ventilate only when outdoor readings are genuinely better.
One big purifier or one per room like a small bedroom?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a small bedroom does more than a larger machine elsewhere.
One big purifier or one per room like a master bedroom?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a master bedroom does more than a larger machine elsewhere.
One big purifier or one per room like a nursery?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a nursery does more than a larger machine elsewhere.
One big purifier or one per room like a kids' room?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a kids' room does more than a larger machine elsewhere.
One big purifier or one per room like a study?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a study does more than a larger machine elsewhere.
One big purifier or one per room like a home office?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a home office does more than a larger machine elsewhere.
One big purifier or one per room like a living room?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a living room does more than a larger machine elsewhere.
One big purifier or one per room like a studio apartment?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a studio apartment does more than a larger machine elsewhere.
One big purifier or one per room like a 1BHK hall?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a 1BHK hall does more than a larger machine elsewhere.
One big purifier or one per room like a guest room?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a guest room does more than a larger machine elsewhere.
One big purifier or one per room like a rented PG room?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a rented PG room does more than a larger machine elsewhere.
One big purifier or one per room like a hostel room?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a hostel room does more than a larger machine elsewhere.
One big purifier or one per room like a shared flat room?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a shared flat room does more than a larger machine elsewhere.
One big purifier or one per room like a sick room?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a sick room does more than a larger machine elsewhere.
One big purifier or one per room like a work-from-home cabin?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a work-from-home cabin does more than a larger machine elsewhere.
One big purifier or one per room like a reading nook?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a reading nook does more than a larger machine elsewhere.
One big purifier or one per room like a home gym?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a home gym does more than a larger machine elsewhere.
One big purifier or one per room like a yoga room?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a yoga room does more than a larger machine elsewhere.
One big purifier or one per room like a meditation room?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a meditation room does more than a larger machine elsewhere.
One big purifier or one per room like a puja room?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a puja room does more than a larger machine elsewhere.
One big purifier or one per room like a walk-in closet?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a walk-in closet does more than a larger machine elsewhere.
One big purifier or one per room like a dressing room?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a dressing room does more than a larger machine elsewhere.
One big purifier or one per room like a dining area?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a dining area does more than a larger machine elsewhere.
One big purifier or one per room like a dining room?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a dining room does more than a larger machine elsewhere.
One big purifier or one per room like a basement room?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a basement room does more than a larger machine elsewhere.
One big purifier or one per room like an attic room?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in an attic room does more than a larger machine elsewhere.
One big purifier or one per room like a salon corner?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a salon corner does more than a larger machine elsewhere.
One big purifier or one per room like a clinic waiting corner?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a clinic waiting corner does more than a larger machine elsewhere.
One big purifier or one per room like a small shop counter?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a small shop counter does more than a larger machine elsewhere.
One big purifier or one per room like a boutique office cabin?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a boutique office cabin does more than a larger machine elsewhere.
One big purifier or one per room like a recording corner?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a recording corner does more than a larger machine elsewhere.
One big purifier or one per room like a gaming setup?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a gaming setup does more than a larger machine elsewhere.
One big purifier or one per room like a baby feeding corner?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in a baby feeding corner does more than a larger machine elsewhere.
One big purifier or one per room like an elderly parent's room?+
Per-room units win in Indian flats — air moves slowly between rooms, so a dedicated unit in an elderly parent's room does more than a larger machine elsewhere.