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City report · California, United States

Thousand Oaks Air quality today

Air quality in Thousand Oaks currently reads AQI 39 (Good): Air quality is satisfactory for everyone.

Air quality right now

AQI 39

Good

Main pollutant: PM2.5
PM2.5, fine particles (µg/m³)
7.0
tree cover
20.4%
trees in this area
64.1K
more trees needed
30.2K

Measured across a 1.2 mi (2 km) radius around Thousand Oaks, 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.

Thousand Oaks · AQI 39 (Good)

Dark green marks tree cover detected inside the study radius.Sentinel-2 L2A (ESA Copernicus) via Earth Search, captured Sep 14, 2026

Thousand Oaks's tree count comes to 64,088 trees across 4.9 sq mi (12.57 km²), 10 points below the 30% tree-cover level considered healthy for this area, so roughly 30,159 more trees would close the gap.

Air quality detail

Air quality in Thousand Oaks today: AQI 39, Good

Main pollutant: PM2.5 · Observed Nov 11, 06:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.

Ground station · Thousand Oaks - Moor, 3.3 mi (5.3 km) away

Health signal

Air quality is satisfactory for everyone.

PM2.5

7.0

PM10

—

NO₂

—

O₃

—

SO₂

—

CO

—

Data: OpenAQ · AirNow

Outdoor exercise
A good day to be active outside
Windows
Open them to air the house
Mask
Not needed
Air purifier
Not needed

Over the last 7 days, the CAMS air-quality model put Thousand Oaks's daily AQI at 37 on average, from 29 on Nov 7 to an hourly peak of 61 on Nov 9.

Last 7 days · model estimateavg 37 · peak 61
Nov 4: AQI 35 (peak 48)Nov 5: AQI 42 (peak 59)Nov 6: AQI 33 (peak 55)Nov 7: AQI 29 (peak 38)Nov 8: AQI 32 (peak 42)Nov 9: AQI 39 (peak 61)Nov 10: AQI 49 (peak 60)
Nov 4Nov 10

Where Thousand Oaks stands: the most polluted cities in the world right now · the cleanest

Tree cover detail

Tree cover in Thousand Oaks: Below target

20.4% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).

10 points below target

Trees in this area

64,088

Target trees

94,247

More trees needed

30,159

CO₂ if planted / yr

663.5 t

Deforestation · 2001–2025

How much forest has Thousand Oaks lost?

Since 2001, the area within 10 km of Thousand Oaks has lost about 4,100 acres (1,660 hectares) of forest (about 3,100 football fields): 42% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. About 102 acres (41 hectares) (2.5%) was deforestation: forest cleared for good for farms, mines or towns.

Satellite image of the area around Thousand Oaks, August 2017

2017: satellite photo from August 2017 of a 5 × 5 km area about 7 km south of the city center.

Forest lost since 2001
4,100 acres (1,660 ha)about 3,100 football fields
Share of its forest
42%of what there was in 2000
Cleared for good
102 acres (41 ha)deforestation: turned into farms, mines or towns

Forest loss is slowing down: about under 1 hectare a year in 2021–2025, down from 578 acres (234 hectares) a year in 2016–2020. The worst year was 2019, when about 1,840 acres (745 hectares) of forest were lost, mostly to wildfires.

Forest lost each year around Thousand Oaks, 2001–2025

Acres of forest lost each year

Forest lost each year around Thousand Oaks, 2001–2025. Use the left and right arrow keys to read each year.1.84K

Show the figures as a table
Forest lost each year around Thousand Oaks, 2001–2025
YearCleared for goodCan grow backTotal
2001under 1 ha14 acres (6 ha)14 acres (6 ha)
200210 acres (4 ha)12 acres (5 ha)22 acres (9 ha)
20034 acres (2 ha)12 acres (5 ha)17 acres (7 ha)
200423 acres (9 ha)29 acres (12 ha)52 acres (21 ha)
20057 acres (3 ha)796 acres (322 ha)803 acres (325 ha)
20068 acres (3 ha)95 acres (38 ha)103 acres (42 ha)
20074 acres (2 ha)14 acres (6 ha)18 acres (7 ha)
200811 acres (4 ha)32 acres (13 ha)43 acres (18 ha)
2009under 1 ha7 acres (3 ha)9 acres (4 ha)
20105 acres (2 ha)7 acres (3 ha)12 acres (5 ha)
2011under 1 haunder 1 haunder 1 ha
2012under 1 ha8 acres (3 ha)9 acres (4 ha)
2013under 1 ha67 acres (27 ha)67 acres (27 ha)
20143 acres (1 ha)23 acres (9 ha)25 acres (10 ha)
20157 acres (3 ha)7 acres (3 ha)14 acres (6 ha)
20165 acres (2 ha)4 acres (2 ha)9 acres (4 ha)
2017under 1 haunder 1 haunder 1 ha
2018under 1 ha1,040 acres (419 ha)1,040 acres (419 ha)
20195 acres (2 ha)1,840 acres (743 ha)1,840 acres (745 ha)
2020under 1 haunder 1 haunder 1 ha
2021under 1 haunder 1 haunder 1 ha
2022under 1 haunder 1 haunder 1 ha
2023under 1 haunder 1 haunder 1 ha
20246 acres (2 ha)under 1 ha7 acres (3 ha)
2025under 1 haunder 1 haunder 1 ha

What is causing deforestation around Thousand Oaks?

  • Wildfirescan grow back97% · 4,000 acres (1,620 ha)
  • Towns and roadscleared for good2% · 84 acres (34 ha)

Also: farms, pasture and plantations, 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
28,100 acres (11,400 ha)
Forest in 2020
25,900 acres (10,500 ha)
Overall change
−2,170 acres (879 ha)less forest than in 2000

Comparing satellite maps from 2000 and 2020, the forest around Thousand Oaks shrank from about 28,100 acres (11,400 hectares) to 25,900 acres (10,500 hectares), a net loss of about 2,170 acres (879 hectares) (−7.7%). New forest grew on about 620 acres (251 hectares), but 2,790 acres (1,130 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 Thousand Oaks

Same 2 km radius, same index — so they compare directly.

  • Simi Valley

    United States

    12.1 km
    Tree cover
    14%
    Air quality
    17
  • Oxnard

    United States

    31.4 km
    Tree cover
    5%
    Air quality
    23
  • Van Nuys

    United States

    35.8 km
    Tree cover
    19%
    Air quality
    34
  • Santa Clarita

    United States

    36.6 km
    Tree cover
    22%
    Air quality
    13
  • Valencia

    United States

    36.9 km
    Tree cover
    11%
    Air quality
    13
  • Hollywood

    United States

    47.7 km
    Tree cover
    17%
    Air quality
    37

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Thousand Oaks air quality (AQI) and tree cover — measured by Airleaf
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Frequently asked

Questions about Thousand Oaks

What is the air quality (AQI) in Thousand Oaks right now?

The latest reading for Thousand Oaks shows an AQI of 39 (Good), measured Nov 11, 06:00 local time by the Thousand Oaks - Moor ground monitoring station, 3.3 mi (5.3 km) away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.

Is it safe to exercise outside in Thousand Oaks today?

At AQI 39 (Good): a good day to be active outside. Windows: open them to air the house. Masks: not needed. The reading changes through the day, so check again before a long run or ride.

What has the air quality in Thousand Oaks been like this week?

Over the last 7 days, the CAMS air-quality model put Thousand Oaks's daily AQI at 37 on average, from 29 on Nov 7 to an hourly peak of 61 on Nov 9. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.

How much forest has the area around Thousand Oaks lost since 2001?

Since 2001, the area within 10 km of Thousand Oaks has lost about 4,100 acres (1,660 hectares) of forest (about 3,100 football fields): 42% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. About 102 acres (41 hectares) (2.5%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss is slowing down: about under 1 hectare a year in 2021–2025, down from 578 acres (234 hectares) a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Thousand Oaks shrank from about 28,100 acres (11,400 hectares) to 25,900 acres (10,500 hectares), a net loss of about 2,170 acres (879 hectares) (−7.7%). New forest grew on about 620 acres (251 hectares), but 2,790 acres (1,130 hectares) were lost.

What is the tree count in Thousand Oaks?

Thousand Oaks has an estimated 64,088 trees across the 4.9 sq mi (12.57 km²) measured — 20.4% tree cover, 10 percentage points short of the 30% tree-cover target set for this area.

How many more trees does Thousand Oaks need?

Thousand Oaks needs roughly 30,159 more trees to close a 10-point shortfall against its 30% tree-cover target — about 663.5 t of extra CO₂ absorbed per year once grown.

How are Thousand Oaks's air quality and tree cover measured?

Air quality is measured by ground monitoring stations near Thousand Oaks, 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 Thousand Oaks; the tree count is an estimate derived from that cover.

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