Douglas, Colorado Air Quality

Douglas County, Colorado (CO)

↑ Worseningover 10 years

Air Quality Grade

49/100

Current Median AQI

Good

5-Year Avg AQI

10-Year Change

Worse

Unhealthy Days/yr

5-year average

Ozone

Primary Pollutant

Ground-Level Ozone

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 in this area has been declining over the past decade.

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	49	84	177	200	149	15	Ozone
2022	46	87	169	242	105	18	Ozone
2021	48	108	177	195	121	42	Ozone
2020	47	80	159	221	123	17	Ozone
2019	47	79	154	220	130	11	Ozone
2018	49	97	156	194	143	27	Ozone
2017	49	90	156	194	152	17	Ozone
2016	44	80	151	251	95	16	Ozone
2015	44	77	169	248	103	11	Ozone
2014	44	74	124	238	116	9	Ozone

What This Means for Douglas County Residents

Douglas, Colorado has received an Air Quality Grade of D (49/100) based on a decade of EPA monitoring data. The current median AQI of 49 falls in the "Good" range.

Concerning trends show air quality has been declining, with the median AQI rising by 5 points over the monitoring period. This could be driven by increased development, wildfire smoke, or industrial activity.

The primary pollutant affecting this area is Ground-Level Ozone. Over the past 5 years, this area has averaged 21 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.