1. Air Pollution and Global Warming: History, Science, and Solutions;Jacobson,2012
2. Air Pollution Emissions Overview;United States Environmental Protection Agency
3. Criteria Air Pollutants;United States Environmental Protection Agency
4. Air Pollution Levels Rising in Many of the World’s Poorest Cities,2016
5. Ambient (Outdoor) Air Pollution
https://www.who.int/news-room/fact-sheets/detail/ambient-(outdoor)-air-quality-and-health