City report · California, United States
Daly City Air quality today
Air quality in Daly City currently reads AQI 55 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 55
Moderate
- PM2.5, fine particles (µg/m³)
- 11.5
- tree cover
- 16.5%
- trees in this area
- 51.8K
- more trees needed
- 42.4K
Measured across a 1.2 mi (2 km) radius around Daly City, CA, USA (4.9 sq mi), from a satellite image of Sep 12, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Daly City · AQI 55 (Moderate)
Daly City's tree count comes to 51,836 trees across 4.9 sq mi (12.57 km²), 13 points below the 30% tree-cover level considered healthy for this area, so roughly 42,411 more trees would close the gap.
Air quality detail
Air quality in Daly City today: AQI 55, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 07:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · West Lake, 1.1 mi (1.7 km) away · median of 28 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
11.5
PM10
—
NO₂
13.4
O₃
21.6
SO₂
—
CO
458.2
Data: OpenAQ · AirGradient, AirNow, Clarity, Scott D, Brian Johnson, San Francisco, Air quality contributor #98000234, Afrooz
- 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 Daly City's daily AQI at 48 on average, from 34 on Nov 8 to an hourly peak of 77 on Nov 7.
Where Daly City stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Daly City: Critically low
16.5% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).
Trees in this area
51,836
Target trees
94,247
More trees needed
42,411
CO₂ if planted / yr
933.0 t
Deforestation · 2001–2025
How much forest has Daly City lost?
Since 2001, the area within 10 km of Daly City has lost about 543 acres (220 hectares) of forest (about 410 football fields): 7.6% of the forest it had in 2000. Most of it (87%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 543 acres (220 ha)about 410 football fields
- Share of its forest
- 7.6%of what there was in 2000
- Cleared for good
- 471 acres (191 ha)deforestation: turned into farms, mines or towns
The worst year was 2007, when about 88 acres (36 hectares) of forest were lost.
Acres of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 23 acres (9 ha) | 5 acres (2 ha) | 28 acres (11 ha) |
| 2002 | 27 acres (11 ha) | under 1 ha | 29 acres (12 ha) |
| 2003 | 53 acres (21 ha) | 4 acres (2 ha) | 57 acres (23 ha) |
| 2004 | 8 acres (3 ha) | under 1 ha | 10 acres (4 ha) |
| 2005 | 48 acres (19 ha) | 3 acres (1 ha) | 51 acres (21 ha) |
| 2006 | 36 acres (14 ha) | under 1 ha | 37 acres (15 ha) |
| 2007 | 85 acres (34 ha) | 3 acres (1 ha) | 88 acres (36 ha) |
| 2008 | 23 acres (9 ha) | 42 acres (17 ha) | 65 acres (26 ha) |
| 2009 | 14 acres (6 ha) | under 1 ha | 15 acres (6 ha) |
| 2010 | 16 acres (7 ha) | under 1 ha | 17 acres (7 ha) |
| 2011 | 12 acres (5 ha) | under 1 ha | 13 acres (5 ha) |
| 2012 | 24 acres (10 ha) | 2 acres (1 ha) | 26 acres (11 ha) |
| 2013 | 2 acres (1 ha) | under 1 ha | 3 acres (1 ha) |
| 2014 | 6 acres (2 ha) | under 1 ha | 6 acres (3 ha) |
| 2015 | 7 acres (3 ha) | under 1 ha | 8 acres (3 ha) |
| 2016 | 7 acres (3 ha) | under 1 ha | 7 acres (3 ha) |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | 6 acres (2 ha) | under 1 ha | 7 acres (3 ha) |
| 2020 | 8 acres (3 ha) | under 1 ha | 8 acres (3 ha) |
| 2021 | 33 acres (13 ha) | under 1 ha | 34 acres (14 ha) |
| 2022 | 4 acres (2 ha) | under 1 ha | 4 acres (2 ha) |
| 2023 | 12 acres (5 ha) | under 1 ha | 12 acres (5 ha) |
| 2024 | 6 acres (2 ha) | under 1 ha | 6 acres (2 ha) |
| 2025 | 9 acres (4 ha) | under 1 ha | 11 acres (4 ha) |
What is causing deforestation around Daly City?
- Towns and roadscleared for good80% · 435 acres (176 ha)
- Wildfirescan grow back7.6% · 41 acres (17 ha)
- Farms, pasture and plantationscleared for good6.3% · 34 acres (14 ha)
Also: 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
- 10,300 acres (4,170 ha)
- Forest in 2020
- 10,400 acres (4,230 ha)
- Overall change
- +141 acres (57 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Daly City stayed about the same size, at about 10,400 acres (4,230 hectares): new forest grew on about 447 acres (181 hectares), and about 309 acres (125 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
In the same region
Measured cities near Daly City
Same 2 km radius, same index — so they compare directly.
- San Mateo19.9 km
United States
- Tree cover
- 30%
- Air quality
- 37
- Oakland20.1 km
United States
- Tree cover
- 7%
- Air quality
- 31
- Richmond27.5 km
United States
- Tree cover
- 5%
- Air quality
- 10
- Hayward33.8 km
United States
- Tree cover
- 20%
- Air quality
- 29
- Fremont45.2 km
United States
- Tree cover
- 15%
- Air quality
- 29
- Vallejo47.8 km
United States
- Tree cover
- 14%
- Air quality
- 7
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Frequently asked
Questions about Daly City
What is the air quality (AQI) in Daly City right now?
The latest reading for Daly City shows an AQI of 55 (Moderate), measured Nov 11, 07:00 local time by 28 ground monitoring stations via OpenAQ (the median of their readings; the nearest is West Lake, 1.1 mi (1.7 km) away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Daly City today?
At AQI 55 (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 Daly City been like this week?
Over the last 7 days, the CAMS air-quality model put Daly City's daily AQI at 48 on average, from 34 on Nov 8 to an hourly peak of 77 on Nov 7. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Daly City lost since 2001?
Since 2001, the area within 10 km of Daly City has lost about 543 acres (220 hectares) of forest (about 410 football fields): 7.6% of the forest it had in 2000. Most of it (87%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Daly City stayed about the same size, at about 10,400 acres (4,230 hectares): new forest grew on about 447 acres (181 hectares), and about 309 acres (125 hectares) were lost.
What is the tree count in Daly City?
Daly City has an estimated 51,836 trees across the 4.9 sq mi (12.57 km²) measured — 16.5% tree cover, 13 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Daly City need?
Daly City needs roughly 42,411 more trees to close a 13-point shortfall against its 30% tree-cover target — about 933.0 t of extra CO₂ absorbed per year once grown.
How are Daly City's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Daly City, via OpenAQ; the 7-day trend is the Open-Meteo / CAMS model's estimate. Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search satellite imagery at 10 m detail across a 1.2 mi (2 km) radius around Daly City; the tree count is an estimate derived from that cover.
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