Overview
- Current AQI readings in Delhi and other northern cities frequently reach hazardous levels during the winter haze, and experts warn indoor air offers no relief for people who spend most of their time inside.
- Effective units use certified True HEPA H13 or H14 filters for fine and ultrafine particles, paired with a thick activated carbon stage to capture gases such as NO2 and VOCs.
- Buyers should match power to room size, targeting at least 250 m³/h CADR for 150–200 sq ft and aiming for 4–5 ACH, or 6–8 ACH for people with respiratory issues.
- Filters in highly polluted areas often clog within 3–6 months, so households should confirm replacement availability, after-sales support, and reasonable energy use for near-continuous operation.
- Ozone-producing ionisers should be avoided, while quiet operation, even air circulation, auto mode, and real-time PM2.5 or AQI displays improve all-day usability.