What is the air quality trend in City of Westminster?

Over the past 8 days, City of Westminster had an average AQI of 39 based on station measurements. The worst day was 2026-08-29 with AQI 44.

How is City of Westminster air quality measured?

Air quality in City of Westminster 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 City of Westminster, United Kingdom

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

Historical PM2.5 and AQI trend from monitoring stations near City of Westminster, United Kingdom.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 18 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-09-05	40	29–59	9.7 µg/m³	12.8	20h	30
2026-09-04	37	23–57	8.9 µg/m³	10.2	24h	30
2026-09-03	38	27–51	9.1 µg/m³	7.9	24h	32
2026-09-02	36	22–64	8.7 µg/m³	7.4	24h	30
2026-09-01	43	27–67	10.7 µg/m³	7.5	24h	32
2026-08-31	41	28–65	10.2 µg/m³	6.5	24h	32
2026-08-30	40	28–70	10.0 µg/m³	10.2	24h	30
2026-08-29	44	32–55	10.9 µg/m³	3.4	2h	36

Back to City of Westminster Air Quality