Do Air Purifiers Actually Work? Honest Guide for Indian Homes

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Do Air Purifiers Actually Work? The Short Answer

Yes, air purifiers work for particles such as PM2.5, dust, pollen and smoke, if the CADR suits the room and the doors and windows are closed. In two US trials, HEPA air cleaners cut indoor PM2.5 by 42% to 60%. An air purifier does not remove gases or smells unless it has an activated carbon filter. An air purifier also does not replace fresh air.

An air purifier is not magic. A purifier cannot clean the air outside, and it cannot fix poor ventilation. The US EPA says the best ways to improve indoor air are to remove the source of the pollution and to let in clean outdoor air. In the EPA's words, filtration "can be an effective supplement to source control and ventilation." Below we share what the evidence really says, in plain words.

What Air Purifiers Can Do

A HEPA purifier can lower the fine dust in a room. In a Detroit trial with 40 older adults, true-HEPA air cleaners cut indoor PM2.5 by 60% over three days. In a one-year trial in 71 homes of children with asthma in Washington State, HEPA cleaners left PM2.5 60% lower in the sleeping area and 42% lower in the living area.

Lower PM2.5 means fewer of the tiny particles you breathe in but cannot see. The US EPA calls PM2.5 the small particles of greatest health concern, and says some portable air cleaners can filter them. A purifier can make a dusty room feel cleaner, but a purifier does not add fresh air.

What Air Purifiers Cannot Do

A purifier has real limits, and you should know them before you buy. Here is what an air purifier cannot do.

• It cannot clean the air outside your home.
• It cannot remove gases or smells without a carbon filter.
• It does not replace fresh-air ventilation.
• It cannot stop pollution at the source, like a smoky stove.
• It cannot fix mould. The EPA says mould comes from damp, so fix the water problem and clean the mould.

A purifier works best with simple steps. Keep windows shut during high-pollution hours. Cut indoor smoke where you can.

Gases are the biggest gap. In the Washington State trial, the HEPA cleaners lowered PM2.5 but did not lower ammonia gas. The EPA says to choose a cleaner with an activated carbon filter for gases, and notes there is no widely used rating system for gas removal. The CADR number on the box is for particles only.

Do Air Purifiers Help Allergies and Asthma?

The evidence here is cautiously positive, not a promise. Some studies show small symptom improvements with a HEPA cleaner. The US EPA puts it this way: "Multiple studies with portable HEPA air cleaners have found improvements in one or more allergy and/or asthma symptom(s)." The EPA adds that the studies do not always show major improvements. The gains are modest and are not noticed by everyone.

A purifier is not a cure for asthma or allergies. It may help reduce some triggers in the air. If you have a health condition, please follow your doctor's advice first.

How to Get the Most From an Air Purifier

How you use an air purifier changes how well it works. Follow these simple steps.

• Run it often: the longer it runs, the more air it filters.
• Close the room: shut windows and doors so it cleans the same air.
• Match the room: use a CADR big enough for the space. The EPA chart asks for at least 65 cfm for a 100 sq ft room and 130 cfm for a 200 sq ft room.
• Change the filter: a clogged filter works far less well.

A short burst of purifier use does little. Steady use in a closed room gives the real benefit.

What Size Air Purifier Do You Need for a Bedroom?

For a bedroom, size the air purifier by its smoke CADR, because smoke stands for the smallest particles. The EPA sizing chart works out to about 65 cfm of CADR for every 100 square feet of floor, based on an 8-foot ceiling. A 12 ft by 10 ft bedroom is 120 square feet, so look for a smoke CADR of at least about 78 cfm. Many Indian listings give CADR in cubic metres per hour, and 78 cfm is about 133 cubic metres per hour. Choose a bigger CADR if your ceiling is higher than 8 feet.

Where to Buy an Air Purifier in India

Amazon India lists many air purifiers with buyer reviews. Read the recent reviews first. Check the filter type, the CADR and the room coverage before you tap buy.

Browse Air Purifiers on Amazon India

Pick a True HEPA filter and the right size for your room. Run it daily for the best effect. While the room clears, a warm drink helps. Our InstaCuppa Multipurpose Electric Kettle boils water in minutes.

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Some links here are affiliate links. If you buy through them we may earn a small commission at no extra cost to you. We only point to products we would suggest to our own family.