What is the air quality trend in Norwich?

Over the past 8 days, Norwich had an average AQI of 56 based on station measurements. The worst day was 2026-07-16 with AQI 99.

How is Norwich air quality measured?

Air quality in Norwich 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 Norwich, United States

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

128h

PM2.5 Station

128h · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	48	25–72	12.9 µg/m³	7h	2
2026-07-21	46	20–87	12.4 µg/m³	18h	2
2026-07-20	42	2–122	11.7 µg/m³	14h	2
2026-07-19	51	15–143	15.3 µg/m³	17h	2
2026-07-18	49	28–106	13.5 µg/m³	17h	2
2026-07-17	79	18–335	37.9 µg/m³	20h	2
2026-07-16	99	11–244	49.8 µg/m³	20h	1
2026-07-15	39	10–109	10.2 µg/m³	15h	2

Back to Norwich Air Quality