The World Health Organization has made available a map showing particulate matter in air worldwide. The map shows PM10 (particles 10 microns in size) concentration for urban areas from 2003 to 2010.
The map was released as part of a data collection project supported by the organization. Those data are stored in a database accessible online that covers 2003 to 2010.
The map shows lower PM10 in the United States and Europe, while China, India and the Middle East saw elevated levels in the period for which data are available. Though data collection appears to have ceased in 2010, facts and figures are still being evaluated and are released periodically.