What is the air quality trend in Castle Rock?

Over the past 8 days, Castle Rock had an average AQI of 65 based on station measurements. The worst day was 2026-08-04 with AQI 83.

How is Castle Rock air quality measured?

Air quality in Castle Rock 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 Castle Rock, United States

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 19 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-08-08	76	75–77	24.0 µg/m³	16.5	2h	19
2026-08-07	72	68–79	22.3 µg/m³	18.3	24h	19
2026-08-06	69	65–73	20.7 µg/m³	17.3	24h	18
2026-08-05	74	63–88	23.0 µg/m³	26.5	24h	18
2026-08-04	83	74–104	27.2 µg/m³	35.4	24h	18
2026-08-03	54	27–78	14.5 µg/m³	12.3	24h	17
2026-08-02	43	38–50	10.3 µg/m³	8.7	24h	17
2026-08-01	52	44–55	13.0 µg/m³	14.5	19h	16

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