Legend:

Data from air monitors is presented within the context of the WHO recommended annual air quality guideline levels and interim targets for PM2.5. These guidelines help to determine which cities and regions are most impacted by the health risks of PM2.5 in the hope to encourage local actions to help improve air quality and work toward meeting the WHO guideline and interim targets.

Seven color bands are used to provide an easy identification of multiples of the 5 µg/m³ WHO PM2.5 guideline, and the interim target levels.

Disclaimer: This interactive map is designed to demonstrate the power of aggregated air quality data, the significance of crowd sourced air quality data to fill the global air quality data gap and provide a global context for outdoor air pollution exposure.

The data is a global aggregation of publicly available PM2.5 data from ground-level measurements conducted by governments, researchers, NGOs, community groups, enterprises and citizens through an network of evolving collaborations, contributions and partnerships.

The data presented here has not been quality assured or endorsed by the Secretariat of the United Nations. The designations concerning the delimitations of the interactive map do not imply the expression of any opinion whatsoever on the part of the Secretariat of the United Nations.

Joint project by UNEP and IQAir www.iqair.com

Population data provided by WorldPop www.worldpop.org