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 28. 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 5.1 µg/m³ and PM10 levels recorded at 5.4 µg/m³. Monitoring of gaseous pollutants shows Nitrogen Dioxide (NO2) at 2.5 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, 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.
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.
Browse Air Quality in United States by cities in alphabetical order:
Frequently Asked Questions about Air Quality in United States
What is the air quality in United States right now?
The current AQI in Washington (capital of United States) is 28 — categorised as Good. Conditions vary across the country — see AQI for all cities for a complete picture.
Which city in United States has the worst air quality right now?
Right now, Nashville has the highest AQI reading in United States at 95 (Moderate).
Which city in United States has the best air quality right now?
Austin currently has the lowest AQI in United States at 16 (Good).
What is the PM2.5 level in Washington today?
The PM2.5 (fine particulate) concentration in Washington, the capital of United States, is currently 5.1 µg/m³. The WHO 24-hour guideline is 15 µg/m³.
Is the air in United States safe to breathe today?
Most cities in United States currently report acceptable air-quality levels, though local conditions vary.
What are the cleanest cities in United States right now?
Top 5 cities in United States with the best (lowest) AQI right now:
- Austin: AQI 16 — Good
- San Antonio: AQI 19 — Good
- Oklahoma City: AQI 21 — Good
- Fort Worth: AQI 23 — Good
- El Paso: AQI 23 — Good
What are the most polluted cities in United States right now?
Top 5 cities in United States with the worst (highest) AQI right now:
- Nashville: AQI 95 — Moderate
- Los Angeles: AQI 85 — Moderate
- San Diego: AQI 62 — Moderate
- Phoenix: AQI 57 — Moderate
- Portland: AQI 54 — Moderate
Air Quality Scales & Resources
Wondering what these AQI numbers mean for your health? Our worldwide air quality guide explains every level of the AQI, PM2.5, PM10, ozone, NO2, CO and SO2 scales, with practical health advice for each range.
→ Understanding Air Quality Levels: read the full guide