What is the air quality trend in Rennes?

Over the past 8 days, Rennes had an average AQI of 42 based on station measurements. The worst day was 2026-07-15 with AQI 51.

How is Rennes air quality measured?

Air quality in Rennes 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 Rennes, France

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

Historical PM2.5 and AQI trend from monitoring stations near Rennes, France.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

137h

PM2.5 Station

137h · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	42	5–62	10.7 µg/m³	18h	2
2026-07-20	40	20–64	9.8 µg/m³	20h	2
2026-07-19	51	14–181	16.7 µg/m³	20h	2
2026-07-18	40	11–68	10.3 µg/m³	18h	2
2026-07-17	51	23–187	16.5 µg/m³	22h	2
2026-07-16	42	8–83	11.0 µg/m³	20h	2
2026-07-15	51	15–172	15.7 µg/m³	18h	2
2026-07-14	19	19–19	4.6 µg/m³	1h	1

Back to Rennes Air Quality