City report · California, United States
Corona Air quality today
Air quality in Corona currently reads AQI 59 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 59
Moderate
- PM2.5, fine particles (µg/m³)
- 13.3
- tree cover
- 9.1%
- trees in this area
- 28.6K
- more trees needed
- 65.7K
Measured across a 1.2 mi (2 km) radius around Corona, CA, USA (4.9 sq mi), from a satellite image of Sep 14, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Corona · AQI 59 (Moderate)
Corona's tree count comes to 28,588 trees across 4.9 sq mi (12.57 km²), 21 points below the 30% tree-cover level considered healthy for this area, so roughly 65,659 more trees would close the gap.
Air quality detail
Air quality in Corona today: AQI 59, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 06:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Mira Loma - Van Bure, 9.4 mi (15.1 km) away · median of 4 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
13.3
PM10
41.0
NO₂
74.9
O₃
0.0
SO₂
0.5
CO
630.1
Data: OpenAQ · AirNow
- 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 Corona's daily AQI at 43 on average, from 30 on Nov 6 to an hourly peak of 88 on Nov 4.
Where Corona stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Corona: Critically low
9.1% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).
Trees in this area
28,588
Target trees
94,247
More trees needed
65,659
CO₂ if planted / yr
1,444 t
Deforestation · 2001–2025
How much forest has Corona lost?
Since 2001, the area within 10 km of Corona has lost about 1,810 acres (732 hectares) of forest (about 1,400 football fields): 18% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. About 654 acres (265 hectares) (36%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from June 2017 of a 5 × 5 km area about 7 km west of the city center.
- Forest lost since 2001
- 1,810 acres (732 ha)about 1,400 football fields
- Share of its forest
- 18%of what there was in 2000
- Cleared for good
- 654 acres (265 ha)deforestation: turned into farms, mines or towns
The worst year was 2006, when about 425 acres (172 hectares) of forest were lost, mostly to wildfires.
Acres of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 32 acres (13 ha) | 14 acres (6 ha) | 46 acres (19 ha) |
| 2002 | 8 acres (3 ha) | 16 acres (7 ha) | 24 acres (10 ha) |
| 2003 | 70 acres (28 ha) | 30 acres (12 ha) | 100 acres (41 ha) |
| 2004 | 39 acres (16 ha) | 10 acres (4 ha) | 48 acres (20 ha) |
| 2005 | 33 acres (13 ha) | 25 acres (10 ha) | 58 acres (23 ha) |
| 2006 | 14 acres (6 ha) | 411 acres (166 ha) | 425 acres (172 ha) |
| 2007 | 10 acres (4 ha) | under 1 ha | 11 acres (5 ha) |
| 2008 | 7 acres (3 ha) | under 1 ha | 7 acres (3 ha) |
| 2009 | 35 acres (14 ha) | 6 acres (3 ha) | 41 acres (17 ha) |
| 2010 | 9 acres (4 ha) | under 1 ha | 10 acres (4 ha) |
| 2011 | 17 acres (7 ha) | 5 acres (2 ha) | 21 acres (9 ha) |
| 2012 | 8 acres (3 ha) | 18 acres (7 ha) | 26 acres (11 ha) |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | 6 acres (3 ha) | under 1 ha | 6 acres (3 ha) |
| 2015 | 282 acres (114 ha) | 74 acres (30 ha) | 356 acres (144 ha) |
| 2016 | 63 acres (25 ha) | under 1 ha | 63 acres (25 ha) |
| 2017 | under 1 ha | 374 acres (151 ha) | 376 acres (152 ha) |
| 2018 | under 1 ha | 142 acres (57 ha) | 144 acres (58 ha) |
| 2019 | 2 acres (1 ha) | 15 acres (6 ha) | 18 acres (7 ha) |
| 2020 | 15 acres (6 ha) | under 1 ha | 15 acres (6 ha) |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | under 1 ha | 12 acres (5 ha) | 12 acres (5 ha) |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Corona?
- Wildfirescan grow back56% · 1,010 acres (408 ha)
- Farms, pasture and plantationscleared for good27% · 479 acres (194 ha)
- Towns and roadscleared for good9.4% · 170 acres (69 ha)
Also: storms, floods and other natural causes, 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
- 16,900 acres (6,820 ha)
- Forest in 2020
- 15,700 acres (6,350 ha)
- Overall change
- −1,170 acres (474 ha)less forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Corona shrank from about 16,900 acres (6,820 hectares) to 15,700 acres (6,350 hectares), a net loss of about 1,170 acres (474 hectares) (−6.9%). New forest grew on about 297 acres (120 hectares), but 1,470 acres (594 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 Corona
Same 2 km radius, same index — so they compare directly.
- Riverside17.9 km
United States
- Tree cover
- 22%
- Air quality
- 38
- Rancho Cucamonga25.8 km
United States
- Tree cover
- 13%
- Air quality
- 37
- Pomona26.4 km
United States
- Tree cover
- 13%
- Air quality
- 49
- Fontana27.0 km
United States
- Tree cover
- 8%
- Air quality
- 29
- Santa Ana31.4 km
United States
- Tree cover
- 13%
- Air quality
- 33
- Moreno Valley31.8 km
United States
- Tree cover
- 6%
- Air quality
- 25
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Frequently asked
Questions about Corona
What is the air quality (AQI) in Corona right now?
The latest reading for Corona shows an AQI of 59 (Moderate), measured Nov 11, 06:00 local time by 4 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Mira Loma - Van Bure, 9.4 mi (15.1 km) away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Corona today?
At AQI 59 (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 Corona been like this week?
Over the last 7 days, the CAMS air-quality model put Corona's daily AQI at 43 on average, from 30 on Nov 6 to an hourly peak of 88 on Nov 4. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Corona lost since 2001?
Since 2001, the area within 10 km of Corona has lost about 1,810 acres (732 hectares) of forest (about 1,400 football fields): 18% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. About 654 acres (265 hectares) (36%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Corona shrank from about 16,900 acres (6,820 hectares) to 15,700 acres (6,350 hectares), a net loss of about 1,170 acres (474 hectares) (−6.9%). New forest grew on about 297 acres (120 hectares), but 1,470 acres (594 hectares) were lost.
What is the tree count in Corona?
Corona has an estimated 28,588 trees across the 4.9 sq mi (12.57 km²) measured — 9.1% tree cover, 21 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Corona need?
Corona needs roughly 65,659 more trees to close a 21-point shortfall against its 30% tree-cover target — about 1,444 t of extra CO₂ absorbed per year once grown.
How are Corona's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Corona, 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 Corona; the tree count is an estimate derived from that cover.
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