What is the air quality trend in Gaithersburg?

Over the past 8 days, Gaithersburg had an average AQI of 79 based on station measurements. The worst day was 2026-07-17 with AQI 168.

How is Gaithersburg air quality measured?

Air quality in Gaithersburg 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 Gaithersburg, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

167h

PM2.5 Station

167h · 5 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	26	26–27	6.3 µg/m³	2h	18
2026-07-21	52	30–73	14.3 µg/m³	24h	30
2026-07-20	68	57–80	20.3 µg/m³	24h	30
2026-07-19	66	36–129	19.4 µg/m³	24h	31
2026-07-18	127	57–157	47.8 µg/m³	24h	32
2026-07-17	168	73–218	97.8 µg/m³	24h	34
2026-07-16	77	53–278	28.9 µg/m³	24h	31
2026-07-15	52	42–80	13.3 µg/m³	21h	33

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