How to Reduce PM2.5 at Home: 10 Practical Steps
To reduce PM2.5 at home, combine source control with appropriate filtration and ventilation. Start with the rooms where people spend time and the activities that raise readings. No single percentage reduction applies to every Indian home.
1. Remove avoidable smoke sources
Keep smoking out of indoor spaces and reduce burning incense, candles and mosquito coils. A fragranced replacement does not necessarily remove an air-quality concern: it may replace particles with other emissions.
2. Use effective kitchen exhaust
Run an externally vented hood while cooking and follow its operating and cleaning instructions. Capture near the cooking source is different from moving a large volume of room air. Check the outlet and replacement-air path with the installer.
3. Match a room purifier to the room
Choose an appropriate clean-air delivery rate and keep the air inlet and outlet clear. Use a speed that delivers useful airflow and is comfortable enough to run when needed. One appliance’s area rating does not prove coverage through several closed doors.
4. Maintain the filter and housing
Follow the specified service procedure and check for poor seating or bypass gaps. Wash only parts described as washable. Filter colour alone cannot tell you its remaining performance.
5. Plan ventilation alongside filtration
Recirculating particle filters do not supply outdoor air or directly solve occupied-room CO₂ buildup. If outdoor air is polluted, assess filtered ventilation. Consider both outdoor contaminants and indoor sources when deciding when to open windows.
6. Assess major leakage paths
Repairing unwanted gaps can help manage outdoor entry, but do not block required ventilation or combustion-air openings. Changes to exhaust or fuel-burning equipment need an appropriate assessment.
7. Clean settled dust carefully
Use suitable damp cleaning and maintain vacuum filters and seals. Pay attention to entrances, rugs and the places where dust accumulates. Cleaning helps manage settled material; it is not a substitute for controlling active smoke sources.
8. Address moisture separately
Investigate leaks, condensation and damp materials. A low PM2.5 reading does not establish that a home has no mould or moisture problem. Particle filtration is not dehumidification.
9. Measure consistently
Use the same monitor position and record room use, outside conditions and equipment settings. Avoid drawing conclusions from a sensor placed directly at a clean-air outlet. Compare similar occupied periods before and after a change.
10. Review rooms that still perform poorly
A persistent reading may reflect a source, restricted airflow, filter issue or unsuitable equipment capacity. Investigate before buying a larger unit. EPA’s air-cleaner guide explains selection and the limits of air cleaning.
When to consider a whole-home system
aqi0’s standalone system filters an outdoor-air supply through a pre-filter and H13 HEPA. It is one option when several rooms need planned filtered ventilation. Coverage is up to 2,000 sq ft carpet area per unit; larger homes and multiple floors need assessment for two units. The technical note defines the conditions behind the product commitment.
Read PM2.5 levels and averaging periods, CADR and room sizing and fresh air versus purifiers before comparing a proposal.
Frequently asked
What about Delhi’s “outdoor air is too polluted, so staying indoors is safer”?
This assumes homes are sealed environments. They aren’t. Indoor PM2.5 in typical Indian homes is 60-110% of outdoor. Being indoors without filtration is barely different from being outdoors, except you also accumulate CO₂.
Do AC units filter PM2.5?
Standard split AC filters are MERV 4-8 — they remove large particles but let PM2.5 pass through. Some premium ACs (Daikin, LG, some Samsung) offer “PM2.5 filters” that are typically MERV 13-15; these reduce PM2.5 in the air the AC circulates but don’t address new air entering the home through gaps. Helpful but not sufficient.
How much can opening windows help?
On rare days when Delhi AQI is below 50 (maybe 10-20 days a year during August-September monsoon peak), opening windows briefly is genuinely refreshing. Otherwise, check the AQI first — if outdoor PM2.5 is above 35 µg/m³, opening a window increases your exposure.
What’s the first measurable PM2.5 reduction I’ll see after a fresh air system installs?
Customer data across our Indian installs shows indoor PM2.5 drops from 80-180 µg/m³ (typical pre-install baseline during NCR winter) to under 20 µg/m³ within 2-3 hours of first operation. Live monitor readings during install make this visible to the homeowner in real-time.