What is the air quality trend in Worcester?

Over the past 21 days, Worcester had an average AQI of 33 based on station measurements. The worst day was 2026-05-17 with AQI 44.

How is Worcester air quality measured?

Air quality in Worcester 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 Worcester, United States

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

382h

PM2.5 Station

382h · 1 station

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	28	16–55	6.7 µg/m³	11h	1
2026-05-28	25	10–40	6.1 µg/m³	19h	2
2026-05-27	32	9–63	7.9 µg/m³	21h	2
2026-05-26	27	15–47	6.4 µg/m³	21h	2
2026-05-25	29	11–51	6.9 µg/m³	19h	2
2026-05-24	29	14–74	7.3 µg/m³	19h	2
2026-05-23	28	8–39	6.7 µg/m³	22h	2
2026-05-22	28	13–50	6.6 µg/m³	17h	2
2026-05-21	30	15–52	7.2 µg/m³	20h	2
2026-05-20	41	22–58	10.1 µg/m³	22h	2
2026-05-19	41	18–61	10.1 µg/m³	19h	2
2026-05-18	40	22–62	9.7 µg/m³	23h	2
2026-05-17	44	22–88	10.9 µg/m³	22h	2
2026-05-16	31	15–46	7.5 µg/m³	12h	2
2026-05-15	32	5–67	8.1 µg/m³	15h	1
2026-05-14	31	9–49	7.4 µg/m³	20h	1
2026-05-13	34	14–53	8.3 µg/m³	18h	1
2026-05-12	42	13–280	21.0 µg/m³	15h	1
2026-05-11	29	5–55	6.9 µg/m³	22h	1
2026-05-10	31	15–49	7.6 µg/m³	19h	1
2026-05-09	41	34–48	9.7 µg/m³	6h	1

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