What is the air quality trend in Portsmouth?

Over the past 15 days, Portsmouth had an average AQI of 33 based on station measurements. The worst day was 2026-10-21 with AQI 49.

How is Portsmouth air quality measured?

Air quality in Portsmouth 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 Portsmouth, United Kingdom

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

334h

PM2.5 Station

334h · 12 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-21	49	24–153	14.3 µg/m³	10.2	16h	6
2026-10-20	46	29–66	11.3 µg/m³	9.9	24h	5
2026-10-19	36	12–147	10.0 µg/m³	4.0	24h	4
2026-10-18	28	5–77	6.3 µg/m³	0.7	24h	4
2026-10-17	31	7–82	7.7 µg/m³	0.4	24h	6
2026-10-16	29	8–125	7.9 µg/m³	1.7	24h	4
2026-10-15	24	2–68	5.7 µg/m³	1.4	24h	3
2026-10-14	40	11–98	10.1 µg/m³	0.8	24h	3
2026-10-13	32	10–115	8.7 µg/m³	0.4	24h	5
2026-10-12	25	8–89	6.6 µg/m³	0.2	24h	5
2026-10-11	39	5–331	18.3 µg/m³	0.4	24h	4
2026-10-10	33	7–81	8.6 µg/m³	0.5	24h	4
2026-10-09	44	16–108	12.2 µg/m³	—	24h	6
2026-10-08	27	13–55	6.4 µg/m³	0.4	24h	5
2026-10-07	26	14–44	6.1 µg/m³	0.6	6h	6

Back to Portsmouth Air Quality