What is the air quality trend in San Marino?

Over the past 14 days, San Marino had an average AQI of 32 based on station measurements. The worst day was 2026-09-10 with AQI 49.

How is San Marino air quality measured?

Air quality in San Marino 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 San Marino, San Marino

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

Historical PM2.5 and AQI trend from monitoring stations near San Marino, San Marino.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

333h

PM2.5 Station

333h · 8 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-09-23	29	21–61	7.2 µg/m³	15.0	23h	11
2026-09-22	38	24–61	9.3 µg/m³	32.9	24h	12
2026-09-21	33	19–52	8.0 µg/m³	11.8	24h	12
2026-09-20	33	14–70	8.1 µg/m³	6.5	24h	12
2026-09-19	33	18–51	7.8 µg/m³	8.3	24h	14
2026-09-18	31	18–45	7.3 µg/m³	9.6	24h	13
2026-09-17	35	14–69	8.8 µg/m³	9.4	24h	13
2026-09-16	28	17–44	6.7 µg/m³	2.8	24h	14
2026-09-15	26	17–39	6.2 µg/m³	2.8	24h	12
2026-09-14	26	14–46	6.1 µg/m³	2.7	24h	13
2026-09-13	27	15–46	6.5 µg/m³	3.1	24h	11
2026-09-12	29	17–60	7.0 µg/m³	3.8	24h	12
2026-09-11	44	20–164	13.2 µg/m³	3.5	24h	12
2026-09-10	49	15–158	13.6 µg/m³	11.4	22h	11

Back to San Marino Air Quality