What is the air quality trend in St Helens?

Over the past 8 days, St Helens had an average AQI of 50 based on station measurements. The worst day was 2026-07-17 with AQI 69.

How is St Helens air quality measured?

Air quality in St Helens 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 St Helens, United Kingdom

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

169h

PM2.5 Station

169h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-22	39	26–66	10.1 µg/m³	4.7	7h	5
2026-07-21	39	17–86	10.2 µg/m³	6.0	24h	8
2026-07-20	35	15–75	8.8 µg/m³	4.2	24h	6
2026-07-19	37	20–73	9.3 µg/m³	4.0	24h	6
2026-07-18	63	23–160	18.7 µg/m³	34.2	24h	6
2026-07-17	69	53–139	20.7 µg/m³	29.1	24h	5
2026-07-16	61	44–108	16.9 µg/m³	20.5	24h	5
2026-07-15	58	39–87	15.9 µg/m³	22.6	18h	6

Back to St Helens Air Quality