What is the air quality trend in McHenry?

Over the past 8 days, McHenry had an average AQI of 102 based on station measurements. The worst day was 2026-07-17 with AQI 227.

How is McHenry air quality measured?

Air quality in McHenry 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 McHenry, United States

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

169h

PM2.5 Station

169h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	59	30–97	17.1 µg/m³	24h	71
2026-07-20	98	54–107	34.2 µg/m³	24h	76
2026-07-19	109	57–160	39.7 µg/m³	24h	79
2026-07-18	51	34–92	13.4 µg/m³	24h	78
2026-07-17	227	75–353	172.3 µg/m³	24h	83
2026-07-16	164	48–336	109.6 µg/m³	24h	77
2026-07-15	51	48–60	12.6 µg/m³	24h	79
2026-07-14	60	60–60	16.5 µg/m³	1h	82

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