What is the air quality trend in Worcester?

Over the past 15 days, Worcester had an average AQI of 47 based on station measurements. The worst day was 2026-07-17 with AQI 97.

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 Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

325h

PM2.5 Station

325h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	25	18–30	5.9 µg/m³	3h	2
2026-07-21	46	3–124	12.2 µg/m³	22h	2
2026-07-20	52	15–92	15.2 µg/m³	21h	2
2026-07-19	53	25–121	15.2 µg/m³	21h	3
2026-07-18	69	17–181	23.5 µg/m³	24h	2
2026-07-17	97	21–227	43.7 µg/m³	22h	3
2026-07-16	82	20–262	39.9 µg/m³	24h	3
2026-07-15	55	25–158	15.7 µg/m³	24h	3
2026-07-14	31	5–52	7.4 µg/m³	24h	3
2026-07-13	34	21–63	8.3 µg/m³	24h	3
2026-07-12	40	19–76	10.0 µg/m³	23h	3
2026-07-11	31	10–47	7.5 µg/m³	24h	2
2026-07-10	36	19–93	9.2 µg/m³	24h	3
2026-07-09	34	15–52	8.2 µg/m³	24h	3
2026-07-08	34	16–52	8.1 µg/m³	21h	3

Back to Worcester Air Quality