young asian woman wearing n95 respiratory mask protect and filter pm2.5 or particulate matter against bad air pollution in city.

air pollution quality aqi unhealthy index allergy mask risk n95 health bad bangkok thailand breath smog poor carbon care concentration dioxide disease face female filter adult asian matters monoxide nitrogen purifier nose outdoor oxide ozone particulate pm10 respiratory woman pm25 pollutants prevention protection safety sick sulfur ventilation people young wearing protect pm2 5 matter city healthcare concept