City report · San Marino
San Marino Air quality today
Air quality in San Marino currently reads AQI 69 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 69
Moderate
- PM2.5, fine particles (µg/m³)
- 20.7
- tree cover
- 45.1%
- trees in this area
- 142K
- more trees needed
- 0
Measured across a 2 km radius around 47890 San Marino (12.57 km²), from a satellite image of Sep 16, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
San Marino · AQI 69 (Moderate)
San Marino's tree count comes to 141,686 trees across 12.57 km², already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in San Marino today: AQI 69, Moderate
Main pollutant: PM2.5 · Observed Nov 10, 17:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 125 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 2 station cities within 125 km, e.g. Florence and Prato
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
20.7
PM10
11.3
NO₂
17.4
O₃
29.0
SO₂
0.3
CO
281.0
- Outdoor exercise
- Fine for most people; unusually sensitive people should take long or hard exercise easier
- Windows
- Fine to open; close them if you are sensitive to pollution
- Mask
- Not needed for most people
- Air purifier
- Worth running if you are sensitive
Over the last 7 days, the CAMS air-quality model put San Marino's daily AQI at 56 on average, from 46 on Nov 10 to an hourly peak of 67 on Nov 6.
Where San Marino stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in San Marino: Healthy tree cover
45.1% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
141,686
Target trees
141,686
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has San Marino lost?
Since 2001, the area within 10 km of San Marino has lost about 69 hectares of forest (about 96 football pitches): 1.4% of the forest it had in 2000. The biggest cause was logging (36%), after which forest can grow back. About 32 hectares (46%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 69 haabout 96 football pitches
- Share of its forest
- 1.4%of what there was in 2000
- Cleared for good
- 32 hadeforestation: turned into farms, mines or towns
The worst year was 2023, when about 14 hectares of forest were lost.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | under 1 ha | under 1 ha | under 1 ha |
| 2002 | under 1 ha | 1 ha | 2 ha |
| 2003 | under 1 ha | under 1 ha | 1 ha |
| 2004 | 1 ha | 2 ha | 3 ha |
| 2005 | 2 ha | 1 ha | 3 ha |
| 2006 | 4 ha | under 1 ha | 5 ha |
| 2007 | 3 ha | 2 ha | 5 ha |
| 2008 | 3 ha | 1 ha | 4 ha |
| 2009 | 1 ha | under 1 ha | 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | under 1 ha | under 1 ha | 1 ha |
| 2012 | 2 ha | 2 ha | 4 ha |
| 2013 | under 1 ha | under 1 ha | 1 ha |
| 2014 | 1 ha | under 1 ha | 2 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | 3 ha | 6 ha | 9 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | 2 ha | 2 ha | 4 ha |
| 2020 | 1 ha | under 1 ha | 1 ha |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | 2 ha | 1 ha | 3 ha |
| 2023 | 2 ha | 13 ha | 14 ha |
| 2024 | 1 ha | under 1 ha | 2 ha |
| 2025 | under 1 ha | 1 ha | 1 ha |
What is causing deforestation around San Marino?
- Loggingcan grow back36% · 25 ha
- Towns and roadscleared for good21% · 14 ha
- Farms, pasture and plantationscleared for good20% · 14 ha
Also: mining and energy, unknown causes.
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
Forest gained and lost, 2000–2020
- Forest in 2000
- 5,010 ha
- Forest in 2020
- 5,040 ha
- Overall change
- +27 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around San Marino stayed about the same size, at about 5,040 hectares: new forest grew on about 94 hectares, and about 67 hectares were lost.
These 2000 and 2020 maps, from the University of Maryland, count any land with trees taller than 5 m as forest, including plantations and orchards. Forest that was cut or burned and had grown back by 2020 counts in both years, so the loss here is smaller than the yearly figures.
These figures cover everything within 10 km of the city center, a wider area than the report above, because forest is usually lost at a city's edges.
Source: Hansen/UMD/Google/USGS/NASA, Global Forest Change (GFC-2025-v1.13); causes: WRI/Google DeepMind drivers of forest loss; both CC BY 4.0, summed by Airleaf for each area. Forest gained and lost 2000–2020: Potapov et al. 2022, UMD GLAD Global Land Cover and Land Use Change, CC BY 4.0. Images: contains modified Copernicus Sentinel data. How it's measured
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Frequently asked
Questions about San Marino
What is the air quality (AQI) in San Marino right now?
The latest reading for San Marino shows an AQI of 69 (Moderate), observed Nov 10, 17:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 125 km, US EPA index. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in San Marino today?
At AQI 69 (Moderate): fine for most people; unusually sensitive people should take long or hard exercise easier. Windows: fine to open; close them if you are sensitive to pollution. Masks: not needed for most people. The reading changes through the day, so check again before a long run or ride.
What has the air quality in San Marino been like this week?
Over the last 7 days, the CAMS air-quality model put San Marino's daily AQI at 56 on average, from 46 on Nov 10 to an hourly peak of 67 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around San Marino lost since 2001?
Since 2001, the area within 10 km of San Marino has lost about 69 hectares of forest (about 96 football pitches): 1.4% of the forest it had in 2000. The biggest cause was logging (36%), after which forest can grow back. About 32 hectares (46%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around San Marino stayed about the same size, at about 5,040 hectares: new forest grew on about 94 hectares, and about 67 hectares were lost.
What is the tree count in San Marino?
San Marino has an estimated 141,686 trees across the 12.57 km² measured — 45.1% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does San Marino need?
San Marino has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are San Marino's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search satellite imagery at 10 m detail across a 2 km radius around 47890 San Marino; the tree count is an estimate derived from that cover.
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