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EPA AQS / AirNow / ECHO
EPA
- Access tierOPEN-API Queryable API, automatable end to end.
- Access methodREST API
- AuthenticationFree API key
- RegionUnited States
- Topicsenvironmental-health health-policy
- Finest geographymonitor
- Update cadencehourly (as published: hourly-annual)
- Statusverified · last checked 2026-08-08
- Registry id
epa-air
Quirks & gotchas
AQS + AirNow need free keys; ECHO open. EJScreen removed from epa.gov 2025 — use mirrors (PEDP/Harvard).
Papers using this source
- Leveraging machine learning models to forecast pediatric allergic rhinitis exacerbation risk based on environmental exposure data. Front Pediatr 2026
- Hourly PM(2.5) Estimates across California from 2018 to 2023. ACS EST Air 2026
- Association between Great Salt Lake desiccation, air quality, and major depressive episodes: an ecological study. Lancet Planet Health 2026
- Air pollution exceedances routinely occur at Thoroughbred racetracks in the contiguous United States. Am J Vet Res 2026
Found by searching PubMed for this source's names and judging each match. A search is not a systematic review, and absence here does not mean a source is unused.
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