What is the air quality trend in Marly-le-Roi?

Over the past 15 days, Marly-le-Roi had an average AQI of 31 based on station measurements. The worst day was 2026-10-19 with AQI 74.

How is Marly-le-Roi air quality measured?

Air quality in Marly-le-Roi 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 Marly-le-Roi, France

Name: Marly-le-Roi Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Marly-le-Roi, France.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

335h

PM2.5 Station

335h · 4 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	21	8–36	5.1 µg/m³	6.1	14h	3
2026-10-20	46	16–88	13.1 µg/m³	14.9	24h	4
2026-10-19	74	57–111	23.0 µg/m³	26.9	24h	3
2026-10-18	54	15–126	16.5 µg/m³	21.0	24h	3
2026-10-17	32	14–70	7.9 µg/m³	10.7	24h	4
2026-10-16	28	7–73	7.1 µg/m³	9.1	24h	4
2026-10-15	35	7–78	9.2 µg/m³	11.2	24h	4
2026-10-14	33	16–68	8.1 µg/m³	11.6	24h	4
2026-10-13	14	5–32	3.5 µg/m³	4.9	24h	4
2026-10-12	22	12–35	5.3 µg/m³	6.4	24h	4
2026-10-11	15	3–46	3.7 µg/m³	4.9	24h	3
2026-10-10	17	8–39	4.1 µg/m³	6.1	24h	3
2026-10-09	18	6–41	4.2 µg/m³	5.3	24h	3
2026-10-08	14	5–22	3.4 µg/m³	5.3	24h	3
2026-10-07	45	10–77	12.3 µg/m³	14.2	9h	3

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