Dataset guide · U.S. Environmental Protection Agency
Read with context.
Select pollutant, monitor and averaging period. Check completeness, units and quality flags; use AirData for public extracts and documentation.
Before using a figure in advocacy, record the exact table or measure, geography, observation period, population, denominator and uncertainty. This page is a research guide; it does not claim that raw data have been imported or independently analyzed.
AQS is not a real-time emergency alert service. Monitor coverage is uneven, and a station is not a measurement of every resident’s personal exposure.
Connect evidence to action
Choose a question, verify the relevant jurisdiction, and explain the action you are asking someone to take. A source-backed draft is a starting point—not a message sent on your behalf.
Use this in an advocacy briefResearch sources
Source text supports this summary. Human editorial approval, service availability and eligibility are separate checks.
Access ambient monitoring data with station and quality-assurance information.
Government / primary publisher · checked Sep 6, 2026
Related policy & program records
Shared topic, not a claim of causation or eligibility.