10 weird air purifier myths you should stop believing in 2025

Myth 1: Air purifiers remove all pollutants instantly
Air purifiers reduce particulate matter over time, but no device can clean an entire room immediately. Filtration is a gradual process.

Myth 2: Air purifiers are only for people with asthma
They help asthma patients, but they also reduce dust, pollen, smoke, and PM2.5 for everyone, improving overall indoor air quality.

Myth 3: You don’t need an air purifier if your home looks clean
Dust and pollutants are microscopic. Even spotless-looking spaces can have high particulate levels.

Myth 4: Opening windows defeats the purpose
Fresh air helps ventilation, but outdoor pollution can raise indoor PM2.5. Many people use purifiers alongside controlled ventilation.

Myth 5: Higher fan speed means better purification
Fan speed affects circulation, not filtration quality. The filter — especially HEPA — does the actual cleaning.

Myth 6: Air purifiers remove odours completely
Some models reduce odours with activated carbon, but they don’t eliminate every smell, especially if the source remains.

Myth 7: HEPA filters last forever
They clog over time and need replacement as per usage and environment. Running old filters reduces efficiency.

Myth 8: Air purifiers protect you from viruses entirely
They can reduce airborne particles, but they are not a standalone solution for infection control.

Myth 9: Bigger machines are always better
A purifier should match the room size. Oversized machines waste energy, and undersized ones clean poorly.

Myth 10: Air purifiers are expensive to run
Most modern purifiers consume power similar to a ceiling fan. Filters are the main recurring cost, not electricity.