What is the air quality trend in San Marino?

Over the past 15 days, San Marino had an average AQI of 51 based on station measurements. The worst day was 2026-07-31 with AQI 61.

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
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

334h

PM2.5 Station

334h · 5 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-08-08	57	44–74	15.3 µg/m³	14.9	7h	6
2026-08-07	50	33–80	13.1 µg/m³	11.8	24h	6
2026-08-06	49	28–102	12.9 µg/m³	15.1	24h	11
2026-08-05	54	26–151	14.7 µg/m³	16.2	24h	10
2026-08-04	53	39–98	14.0 µg/m³	17.8	24h	9
2026-08-03	53	35–120	14.4 µg/m³	15.6	24h	8
2026-08-02	48	33–116	12.4 µg/m³	15.5	24h	6
2026-08-01	54	34–112	14.4 µg/m³	18.8	24h	5
2026-07-31	61	37–291	22.4 µg/m³	19.5	24h	6
2026-07-30	50	35–62	12.4 µg/m³	18.0	24h	6
2026-07-29	52	36–71	13.2 µg/m³	14.4	24h	6
2026-07-28	56	30–283	20.7 µg/m³	14.1	24h	5
2026-07-27	60	36–180	18.4 µg/m³	16.4	24h	6
2026-07-26	37	11–115	9.5 µg/m³	7.8	24h	5
2026-07-25	34	12–75	8.6 µg/m³	3.7	15h	5

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