What is the air quality trend in Hereford?

Over the past 21 days, Hereford had an average AQI of 46 based on station measurements. The worst day was 2026-08-19 with AQI 59.

How is Hereford air quality measured?

Air quality in Hereford 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 Hereford, United Kingdom

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

Historical PM2.5 and AQI trend from monitoring stations near Hereford, United Kingdom.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

413h

PM2.5 Station

413h · 2 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-09-05	40	14–66	10.3 µg/m³	11h	1
2026-09-04	34	5–71	8.6 µg/m³	17h	2
2026-09-03	41	11–70	10.7 µg/m³	22h	2
2026-09-02	36	7–67	9.0 µg/m³	21h	2
2026-09-01	44	8–88	12.1 µg/m³	23h	2
2026-08-31	40	13–71	10.5 µg/m³	20h	2
2026-08-30	50	17–88	13.8 µg/m³	20h	2
2026-08-29	43	8–76	11.4 µg/m³	21h	2
2026-08-28	48	14–83	13.4 µg/m³	19h	2
2026-08-27	55	20–125	15.1 µg/m³	21h	2
2026-08-26	57	22–88	16.1 µg/m³	22h	2
2026-08-25	51	15–103	14.2 µg/m³	22h	2
2026-08-24	48	17–94	13.0 µg/m³	21h	2
2026-08-23	49	13–77	13.0 µg/m³	20h	2
2026-08-22	57	28–99	15.8 µg/m³	19h	1
2026-08-21	46	20–83	12.1 µg/m³	19h	2
2026-08-20	54	15–111	15.6 µg/m³	23h	2
2026-08-19	59	10–432	29.2 µg/m³	23h	2
2026-08-18	54	16–115	15.4 µg/m³	22h	2
2026-08-17	47	18–99	12.7 µg/m³	22h	1
2026-08-16	33	21–41	7.8 µg/m³	5h	2

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