Cloth masks, surgical masks and scarves
Loose masks and scarves stop dust you can see, not the fine particles that harm health. A respirator that seals is what works.
Why loose masks fall short
PM2.5 particles are about 30 times thinner than a human hair. Two things decide whether a mask stops them:
- The filter material. Respirator filter material (N95, FFP2) is designed and tested to catch fine particles. Cotton, scarves and most fashion masks are not.
- The fit. Air takes the easiest path. If there’s a gap at the nose or cheeks, most of the air you breathe goes around the filter, however good it is. Surgical masks are loose by design.
Comparison
| Covering | Filter for fine particles | Fit / seal | Protection against PM2.5 |
|---|---|---|---|
| Scarf, dupatta, handkerchief | Poor | None | Very little |
| Cloth or fashion mask | Poor to fair | Loose | Little |
| Surgical / procedure mask | Fair | Loose | Limited |
| “Pollution mask” with a carbon pad, ear loops | Varies, often unverified | Often loose | Unreliable |
| Certified N95 / FFP2 / BIS FFP2, head straps, sealed | Good (≥ 94–95%) | Tight | Good, when it seals |
India’s health ministry handbook says paper masks, handkerchiefs, scarves and cloth are not effective in poor to severe air pollution.
What this means
- If you’re going to wear something, make it a certified respirator and check the fit.
- A loose mask can give false confidence and lead people to spend longer outdoors.
- No mask protects against pollution gases (nitrogen dioxide, ozone). Reducing time outdoors still matters.