World Health Organization2021-09-212021-09-222021-09-219789240034228 (electronic version)9789240034211 (print version)https://iris.who.int/handle/10665/345329xxi, 273 p.enCC BY-NC-SA 3.0 IGOhttps://creativecommons.org/licenses/by-nc-sa/3.0/igoWHO guidelineAir PollutionGuidelineEnvironmental ExposureParticulate MatterWHO global air quality guidelines: particulate matter (PM2.5 and PM10), ozone, nitrogen dioxide, sulfur dioxide and carbon monoxidePublicationsstandardsWorld Health Organization