What is the air quality trend in Rockville?

Over the past 8 days, Rockville had an average AQI of 83 based on station measurements. The worst day was 2026-07-17 with AQI 166.

How is Rockville air quality measured?

Air quality in Rockville 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 Rockville, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 3 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	54	31–73	14.7 µg/m³	22h	28
2026-07-20	69	59–84	20.5 µg/m³	24h	30
2026-07-19	64	37–89	18.8 µg/m³	24h	31
2026-07-18	130	56–158	49.8 µg/m³	24h	32
2026-07-17	166	56–221	97.8 µg/m³	24h	34
2026-07-16	81	55–196	29.0 µg/m³	24h	32
2026-07-15	51	40–78	12.9 µg/m³	24h	32
2026-07-14	50	48–52	12.1 µg/m³	2h	32

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