What is the air quality trend in Merrifield?

Over the past 8 days, Merrifield had an average AQI of 80 based on station measurements. The worst day was 2026-07-17 with AQI 168.

How is Merrifield air quality measured?

Air quality in Merrifield 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 Merrifield, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Merrifield, 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 · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	25	25–25	6.0 µg/m³	1h	1
2026-07-21	52	28–77	14.2 µg/m³	24h	32
2026-07-20	69	58–86	20.4 µg/m³	24h	32
2026-07-19	64	36–86	18.6 µg/m³	24h	34
2026-07-18	129	58–162	49.2 µg/m³	24h	35
2026-07-17	168	57–216	98.6 µg/m³	24h	36
2026-07-16	85	53–196	31.3 µg/m³	24h	35
2026-07-15	52	42–78	13.2 µg/m³	22h	36

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