What is the air quality trend in Hartford?

Over the past 15 days, Hartford had an average AQI of 42 based on station measurements. The worst day was 2026-07-17 with AQI 72.

How is Hartford air quality measured?

Air quality in Hartford 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 Hartford, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

335h

PM2.5 Station

335h · 3 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	43	15–74	11.0 µg/m³	22h	3
2026-07-20	41	18–95	10.9 µg/m³	24h	3
2026-07-19	52	22–80	14.4 µg/m³	24h	4
2026-07-18	59	24–116	17.4 µg/m³	24h	3
2026-07-17	72	15–162	24.6 µg/m³	24h	4
2026-07-16	66	29–158	20.4 µg/m³	24h	4
2026-07-15	51	29–84	13.4 µg/m³	24h	4
2026-07-14	35	18–59	8.4 µg/m³	24h	4
2026-07-13	33	18–53	7.9 µg/m³	24h	4
2026-07-12	29	12–50	7.0 µg/m³	24h	4
2026-07-11	31	13–54	7.5 µg/m³	24h	4
2026-07-10	28	17–38	6.6 µg/m³	24h	4
2026-07-09	34	16–67	8.4 µg/m³	24h	4
2026-07-08	31	16–46	7.4 µg/m³	24h	4
2026-07-07	30	30–30	7.2 µg/m³	1h	5

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