Air Quality
Specific Measure
Annual mean concentration of particulate matter with diameter of 2.5 micrometers or less (roughly 3% of the width of a human hair).
(Source: Authors' analysis of Environmental Protection Agency data).
How does the US rank globally?
- Specific Measure: (Same as above.)
(Source: Authors’ analysis of World Health Organization data).
- Percentage of countries the US outperforms: 73% (out of 30 countries)
- International Rank Trend: Worsening
National Trend Improving
For more information about data sources and treatments, download the Data Notes.