Air Quality Index (AQI) in United States 🇺🇸
Live Air Quality Index (AQI) and PM2.5 Levels in United States
Currently, the Air Quality Index (AQI) in Washington, the capital of United States, is measured at a score of 55. According to the US EPA health standard, this air quality rating is categorized as Good. The current atmosphere in Washington is influenced by a PM2.5 (fine particulate matter) concentration of 11.3 µg/m³ and PM10 levels recorded at 11.7 µg/m³. Monitoring of gaseous pollutants shows Nitrogen Dioxide (NO2) at 14.9 µg/m³.
Beyond the primary urban hubs, atmospheric conditions and smog levels fluctuate across United States based on industrial output, traffic density, and local weather patterns. Real-time pollution data and respiratory health alerts are also being actively monitored in cities like New York City, Los Angeles, Brooklyn, Chicago and Houston. Tracking these air quality metrics is essential for residents nationwide to manage outdoor exposure and maintain respiratory safety during periods of increased particulate concentration.
Air Quality Snapshot: United States Right Now
Across 100 monitored cities in United States, live air quality currently ranges from a low of 7 AQI in Ironville (the cleanest air right now) to a high of 87 AQI in Los Angeles (the most polluted). By US EPA health band, the nationwide distribution stands at 73 Good, 27 Moderate. The average fine-particulate (PM2.5) concentration across these cities is 8.0 µg/m³ — approximately 1.6 times the World Health Organization (WHO) annual air quality guideline of 5 µg/m³.
United States Air Quality: Major Cities Index
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Pollution Monitor & AQI Forecast: United States Regions
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* Air Quality Index (AQI) data for United States is calculated using the US EPA standard. Information is processed from multiple monitoring stations detecting PM2.5, PM10, and gaseous pollutants to ensure accuracy for respiratory health planning.
What Today's Readings Mean in United States
The median reading across 100 monitored cities is 39.0 AQI. The national spread is 80 points, from 7 in Ironville to 87 in Los Angeles. Average PM2.5 is 8.0 µg/m³ (1.6× the WHO annual guideline).
At least one monitored location is in the Moderate range. People unusually sensitive to air pollution may want to reduce prolonged outdoor exertion there.
Air Quality in United States — FAQ
Common questions about AQI levels, pollutants, and data sources for United States.