Indoor Air Pollution at Home: Frying, Coils and Incense Ranked
Everyone worries about smog outside and leaves the kitchen exhaust fan off while deep frying pakoras with the windows shut. The air inside your own house can be worse.
In brief
- Biggest indoor sources: deep frying without ventilation, mosquito coils, incense burned in closed rooms
- Cheapest fix: using the exhaust fan or opening a window, every single time, not sometimes
- Time needed: zero extra time if you build it into cooking, seconds to switch a coil for a plug-in
- Skip fixing: nothing here, all of these are worth doing regardless of budget
Prefer to listen? This post as a 2 min video
Air purifiers get marketed hard and cost real money. Before spending on one, it is worth ranking what actually pollutes the air inside a typical desi home, because the cheapest fixes usually beat the expensive gadget.
Ranking the real risk sources
1. Deep frying and high-heat cooking without ventilation, the biggest one
Frying releases fine particles and, when oil is reused or overheated past its smoke point, aldehydes that irritate the airways with prolonged exposure. A kitchen with the exhaust fan off and door closed during a big frying session, common on Eid or during wedding cooking, can build up particulate levels well above what outdoor smog alerts warn about.
2. Mosquito coils burned overnight in a closed bedroom
A burning coil in a sealed room for eight hours is a sustained smoke source right next to your face while you sleep. This is genuinely one of the more avoidable indoor risks in desi homes.
3. Incense, agarbatti, burned in small closed rooms
Occasional and ventilated use is a much smaller concern than daily burning in a small closed room, particularly a child’s room or a sickroom where windows stay shut.
4. Tandoor or wood-fired cooking indoors without a proper chimney
Less common in city flats but still present in some homes and in commercial kitchens, and one of the more serious sources when ventilation is genuinely absent.
Ventilation habits that cost nothing
- Switch on the kitchen exhaust fan before you start frying, not after the smoke is already thick.
- Crack a window in the kitchen even in winter for the duration of high-heat cooking.
- Never fry with the kitchen door closed if you can help it, let air move through to another room.
- Air out any room used for incense or coils for at least 15 minutes afterward, door and window both.
- Switch from a burning mosquito coil to a plug-in liquid vaporiser or a bed net for sleeping hours specifically.
Where a purifier or plant does and does not help
An air purifier can meaningfully reduce fine particulate matter in a closed room over time, but it will not undo the burst of smoke from frying if the exhaust fan is off, since the purifier cannot keep up with an active source in real time. Houseplants have negligible measurable effect on indoor air quality at the scale of a normal room, whatever internet lists claim, so do not rely on a few pots of money plant instead of ventilation.
Dust, another indoor source people forget
Rugs, curtains and upholstered furniture that go weeks without a proper clean hold onto dust, which gets stirred up every time someone sits down or a fan switches on. A quick vacuum or a damp cloth wipe of surfaces twice a week, and washing curtains every month or two, cuts down on this without needing any new equipment. This matters more during dust storm season, when keeping windows shut during the storm itself and airing the house out once it passes works better than leaving windows open throughout.
Older desi homes were often built with higher ceilings, courtyards and cross-ventilation specifically because trapped smoke from cooking fires was a known problem long before “indoor air quality” was a phrase anyone used. Ritucharya, the Ayurvedic seasonal routine, also recommended airing out homes at specific points in the day, described here as tradition rather than a measured standard.
Anyone with asthma, COPD or a chronic cough should be especially strict about kitchen ventilation during frying and should avoid mosquito coils and heavy incense entirely rather than reducing them. Infants and pregnant women should not be in a room with an active coil or heavy incense smoke for extended periods. If a family member develops a persistent cough, wheeze or breathlessness that seems tied to being at home rather than outside, that pattern is worth mentioning to a doctor directly, since indoor exposure is easy to overlook as a cause.
Try this today
Next time you fry anything, turn the exhaust fan on before the oil is even hot, and leave it running five minutes after you finish.
For the cooking oil side of this, our guide on reusing frying oil safely and smoke points covers why overheated, reused oil makes frying smoke worse. This habit lives in our Tiny Habits series alongside other cheap, quick fixes.
Frequently asked questions
What causes the most indoor air pollution in a desi home?
Deep frying and high-heat cooking with no ventilation usually tops the list. After that come mosquito coils burned all night in a closed bedroom, incense in small shut rooms, and indoor tandoor or wood fires without a proper chimney. Dust in rugs and curtains adds to it too.
Is the smoke from frying pakoras harmful?
In a closed kitchen, it can be. Frying releases fine particles, and oil that’s reused or overheated past its smoke point gives off aldehydes that irritate the airways with repeated exposure. Switching the exhaust fan on before the oil heats, and keeping a window open, makes a big difference.
Is it safe to sleep with a mosquito coil burning?
It’s best avoided. A coil in a sealed bedroom is a steady smoke source beside your face for hours. A plug-in liquid vaporiser or a bed net is the easier swap, and any room where a coil has burned should be aired out afterwards.
Are electric mosquito repellents safer than coils?
Generally yes for the air you breathe, since they don’t produce visible smoke. Still use them in a room with some airflow rather than one shut tight all night.
Is burning agarbatti bad for health?
Occasional use in a ventilated room is a small concern. The problem is daily burning in a small closed room, especially a child’s room or a sickroom. You don’t need to give up incense for religious or cultural reasons, just open a door or window and air the room after.
Do air purifiers work against frying smoke and dust?
They lower background fine particles in a closed room over time, but they can’t keep up with an active source like frying with the fan off. Think of a purifier as an extra, never a replacement for ventilation.
Do indoor plants like money plant clean the air?
Not in any way you’d notice in a normal-sized room, whatever online lists say. Keep them because you like them, but open a window instead of relying on a few pots.
Is indoor smoke dangerous for babies and pregnant women?
They shouldn’t spend long stretches in a room with a burning coil or heavy incense. Babies breathe fast and their lungs are still developing, so a smoke-free, aired-out room is the safer default for them, and for anyone who’s pregnant.
I have asthma. What should I change at home?
Be strict rather than moderate. Run the kitchen exhaust every time anyone fries, and drop mosquito coils and heavy incense completely instead of just cutting back. The same goes for COPD or a long-standing cough.
When is a cough at home worth seeing a doctor about?
When a cough, wheeze or breathlessness keeps coming back and seems tied to being indoors rather than outside. Tell the doctor about coils, incense and cooking smoke at home, because indoor exposure is easy to overlook as a cause.
Should I keep windows closed during smog or dust storms?
Close them while the storm or worst smog is on, then air the house once it passes. For dust in general, a damp wipe or vacuum twice a week and washing curtains every month or two helps without buying anything.