Air Quality
Moderate
Active Contamination
4
Active Permits
4
Air quality in Arapahoe County is rated moderate with a median AQI of 51 (273 days measured in 2025). 1 industrial facility reports toxic chemical releases totaling 1 lbs. 4 contamination sites are tracked, all with completed or ongoing remediation.
Air Quality — Arapahoe County (2025)i
AQSThe Air Quality Index measures how clean or polluted the air is on a given day. AQI is reported at the county level. A score of 0-50 is considered good; 51-100 is moderate; above 100 may be unhealthy for sensitive groups.
Median AQI
PM2.5 Daysi
33Ozone Daysi
240Industrial Monitoringi
Wastewater & Stormwater Permits (NPDES)i
NPDESContamination Sitesi
Contaminated sites tracked by the EPA and state agencies. Superfund sites are the most seriously contaminated locations. Brownfields are former industrial properties being cleaned up for reuse. LUST sites have confirmed leaks from underground storage tanks.