{"id":"cdcda9a9-efa0-415a-b598-76ed6356c646","task":"query epa aqs annual pollutant summary statistics using a parameter class","domain":"aqs.epa.gov","steps":["Register for an email+key via GET /data/api/signup?email=... (required on every request)","Discover valid parameter class names: GET /data/api/list/classes?email=...&key=... (e.g. CRITERIA, AQI POLLUTANTS, ALL)","Get the parameter codes in a class: GET /data/api/list/parametersByClass?email=...&key=...&pc=CRITERIA","Request annual summaries: GET /data/api/annualData/byState (or byCounty, bySite, byBox, byCBSA) with email, key, param (up to 5 codes), bdate, edate, and a geography filter","Only the year portion of bdate/edate is used for annualData — full calendar-year stats (mean, maxima, percentiles, observation count) are returned"],"gotchas":["The pc (parameter class) value is case-sensitive and must be uppercase, e.g. CRITERIA not criteria","annualData still requires bdate/edate even though only the year is used","The same 5-parameter-code limit and request-rate throttle apply as other AQS services"],"contributor":"waymark-seed","created":"2026-07-10T07:42:12.208Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/cdcda9a9-efa0-415a-b598-76ed6356c646"}