What is the air quality trend in Highlands Ranch?

Over the past 13 days, Highlands Ranch had an average AQI of 31 based on station measurements. The worst day was 2026-07-06 with AQI 90.

How is Highlands Ranch air quality measured?

Air quality in Highlands Ranch 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 Highlands Ranch, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

57h

PM2.5 Station

57h · 1 station

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	21	5–69	5.6 µg/m³	12h	1
2026-07-20	7	3–17	1.7 µg/m³	4h	1
2026-07-19	65	5–99	22.7 µg/m³	3h	1
2026-07-18	72	3–156	26.0 µg/m³	5h	1
2026-07-17	48	4–116	15.3 µg/m³	8h	1
2026-07-16	11	6–20	2.5 µg/m³	3h	1
2026-07-14	26	4–65	6.9 µg/m³	5h	1
2026-07-13	4	3–5	0.9 µg/m³	4h	1
2026-07-12	4	1–7	1.0 µg/m³	4h	1
2026-07-11	3	1–5	0.7 µg/m³	4h	1
2026-07-10	3	2–5	0.8 µg/m³	3h	1
2026-07-06	90	90–90	30.7 µg/m³	1h	23
2026-07-02	53	53–53	13.0 µg/m³	1h	21

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