# Where PM2.5 at Home Comes From and How to Reduce It

Dust at home does not only come from outside. Learn where it starts and how to cut it down day to day.

- Page: https://demo.coway.one/en/articles/pm25-at-home
- 08 Oct 2026

PM2.5 refers to particles no larger than 2.5 microns. Dust this fine still reaches indoors with the doors and windows shut, and everyday activity at home creates it too.

## Where indoor dust comes from

- Outdoor air entering through openings and gaps
- Cooking, especially frying and grilling
- Burning incense and candles
- Cigarette smoke

## Reducing dust day to day

Check the air quality before opening windows, run the cooker hood while cooking, and clean floors with a vacuum that has a good filter.

## Where an air purifier helps

An air purifier reduces dust suspended in a room when it is sized for the space. Compare the clean air delivery rate, and run it continuously in rooms where you spend the most time, such as the bedroom.

See every model on the [air purifiers](https://demo.coway.one/en/products/air-purifier) page.