US EPA Air Quality System certified monitor data for a county
US EPA Air Quality System certified monitor data for a county: daily values per monitor (mean, daily max, AQI, method, site) or annual summaries (mean, 98th/99th percentiles, exceedance counts) for PM2.5, PM10, ozone, NO2, SO2, CO or lead. County by name or FIPS code. Official quality-assured data, published about six months after measurement.
Answeringour last check, 2026-10-24
1 of 1checks answered this week
42 msmedian answer time
$0.002listed price per call
$0.002price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://api.companyrecords-api.workers.dev/api/gov/epa-aqs-air-quality
| Category | Code and developer |
|---|---|
| Provider host | api.companyrecords-api.workers.dev |
| Networks | eip155:10, eip155:137, eip155:143, eip155:42161, eip155:42220, eip155:480, eip155:5042, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp, xrpl:0 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-24 | valid payment request | 402 | $0.002 | 42 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"county": "Los Angeles",
"from": "2026-04-01",
"pollutant": "pm25",
"state": "CA",
"to": "2026-04-03"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"county": {
"description": "County name (Los Angeles) or 3-digit FIPS code (037)",
"type": "string"
},
"from": {
"description": "Daily mode start date YYYY-MM-DD (data lags ~6 months)",
"type": "string"
},
"limit": {
"description": "Max rows 1-500 (default 100)",
"type": "integer"
},
"pollutant": {
"description": "pm25 (default), pm10, ozone, no2, so2, co, lead",
"enum": [
"pm25",
"pm10",
"ozone",
"no2",
"so2",
"co",
"lead"
],
"type": "string"
},
"state": {
"description": "2-letter state, e.g. CA",
"type": "string"
},
"to": {
"description": "Daily mode end date YYYY-MM-DD, same calendar year, max 31 days after from",
"type": "string"
},
"year": {
"description": "Annual mode: a year such as 2025 (returns annual summaries instead of daily values)",
"type": "integer"
}
},
"required": [
"state",
"county"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}