Denver, Colorado Air Quality

Denver County, Colorado (CO)

→ Stableover 10 years

Air Quality Grade

52/100

Current Median AQI

Moderate

5-Year Avg AQI

10-Year Change

Worse

Unhealthy Days/yr

5-year average

PM2.5

Primary Pollutant

Fine Particulate Matter (PM2.5)

10-Year AQI Trend

The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days).

Air Quality Day Breakdown

Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).

Year-by-Year Data

Year	Median AQI	90th Pct	Max AQI	Good Days	Moderate	Unhealthy+	Pollutant
2023	54	77	179	131	228	6	Ozone
2022	52	77	112	161	197	7	Ozone
2021	55	100	166	128	202	35	Ozone
2020	53	80	150	137	212	17	PM2.5
2019	54	77	153	139	223	3	PM2.5
2018	54	80	150	124	231	10	PM2.5
2017	53	74	128	149	214	2	NO2
2016	54	74	112	127	235	4	NO2
2015	54	77	146	119	237	9	PM2.5
2014	53	74	152	152	210	3	PM2.5

What This Means for Denver County Residents

Denver, Colorado has received an Air Quality Grade of C (52/100) based on a decade of EPA monitoring data. The current median AQI of 54 falls in the "Moderate" range.

The primary pollutant affecting this area is Fine Particulate Matter (PM2.5). Over the past 5 years, this area has averaged 14 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.