What is the air quality trend in Hérouville-Saint-Clair?

Over the past 21 days, Hérouville-Saint-Clair had an average AQI of 38 based on station measurements. The worst day was 2026-07-12 with AQI 74.

How is Hérouville-Saint-Clair air quality measured?

Air quality in Hérouville-Saint-Clair 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 Hérouville-Saint-Clair, France

Name: Hérouville-Saint-Clair Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Hérouville-Saint-Clair, France.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

391h

PM2.5 Station

391h · 1 station

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	20	9–47	4.9 µg/m³	6h	2
2026-07-21	17	4–31	4.1 µg/m³	10h	2
2026-07-20	27	4–63	6.7 µg/m³	12h	1
2026-07-19	21	1–31	5.0 µg/m³	11h	1
2026-07-18	55	6–87	15.9 µg/m³	23h	1
2026-07-17	68	25–86	20.6 µg/m³	24h	1
2026-07-16	60	34–76	16.8 µg/m³	24h	1
2026-07-15	60	16–80	17.6 µg/m³	24h	1
2026-07-14	68	59–81	20.4 µg/m³	24h	1
2026-07-13	37	3–84	10.4 µg/m³	24h	1
2026-07-12	74	27–212	27.1 µg/m³	24h	1
2026-07-11	66	55–74	19.3 µg/m³	24h	1
2026-07-10	44	18–64	11.2 µg/m³	24h	1
2026-07-09	30	7–61	7.5 µg/m³	24h	1
2026-07-08	27	4–64	6.8 µg/m³	20h	1
2026-07-07	25	4–45	6.0 µg/m³	8h	2
2026-07-06	22	5–31	5.2 µg/m³	7h	1
2026-07-05	16	6–30	3.8 µg/m³	24h	1
2026-07-04	24	2–89	6.1 µg/m³	24h	2
2026-07-03	21	2–37	4.9 µg/m³	23h	1
2026-07-02	18	14–21	4.4 µg/m³	7h	2

Back to Hérouville-Saint-Clair Air Quality