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US Hourly Air Quality (EPA AQS) 2015–2024
Hourly air quality readings from all US EPA monitoring stations, 2015–2024.
Dataset Details
239M+ rows covering 6 NAAQS criteria pollutants across all US monitoring stations for 10 years.
Fields
| Column | Description |
|---|---|
timestamp |
Local date and time of measurement |
pollutant |
Pollutant name: ozone, pm25, pm10, so2, co, no2 |
value |
Raw measurement value |
unit |
Unit of measurement |
aqi |
Calculated AQI (EPA standard breakpoints) |
state_name / state_code |
State name and FIPS code |
county_name / county_code |
County name and FIPS code |
site_num |
EPA monitoring site number |
latitude / longitude |
Station coordinates |
mdl |
Method detection limit |
datum |
Coordinate datum |
Pollutants
| Value | Pollutant |
|---|---|
ozone |
Ozone (O₃) |
pm25 |
Fine particulate matter (PM2.5) |
pm10 |
Coarse particulate matter (PM10) |
so2 |
Sulfur dioxide |
co |
Carbon monoxide |
no2 |
Nitrogen dioxide |
Source
EPA Air Quality System (AQS) — bulk hourly data files. No API key required.
License
EPA data is in the public domain (US Government Work). Released as CC0.
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