What is the air quality trend in Denver?

Over the past 13 days, Denver had an average AQI of 21 based on station measurements. The worst day was with AQI .

How is Denver air quality measured?

Air quality in Denver is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Denver, United States

Name: Denver Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Denver, United States.

Current AQI
Good

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Trend

262h

PM2.5 Trend

262h · 37 stations

Daily Summary

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-04-18	25	18–38	6.0 µg/m³	6.7	18h	37
2026-04-17	17	14–21	4.0 µg/m³	19.5	15h	37
2026-04-16	16	14–18	3.8 µg/m³	26.8	24h	37
2026-04-15	16	15–18	3.8 µg/m³	23.8	24h	36
2026-04-14	16	8–18	3.9 µg/m³	31.2	24h	34
2026-04-13	15	13–19	3.7 µg/m³	15.8	16h	36
2026-04-12	17	13–20	4.0 µg/m³	10.6	24h	36
2026-04-11	36	16–55	8.7 µg/m³	35.3	24h	36
2026-04-10	32	18–57	7.8 µg/m³	41.9	24h	36
2026-04-09	23	18–31	5.4 µg/m³	47.0	18h	32
2026-04-08	17	15–18	4.2 µg/m³	17.2	8h	36
2026-04-07	31	16–51	7.5 µg/m³	26.8	24h	37
2026-04-06	23	10–32	5.5 µg/m³	48.3	19h	34

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