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City report · Colorado, United States

Centennial Air quality today

Air quality in Centennial currently reads AQI 34 (Good): Air quality is satisfactory for everyone.

Air quality right now

AQI 34

Good

Main pollutant: Ozone
PM2.5, fine particles (µg/m³)
2.9
tree cover
18.8%
trees in this area
59.1K
more trees needed
35.2K

Measured across a 1.2 mi (2 km) radius around Inverness, Centennial, Colorado, United States of America (4.9 sq mi), from a satellite image of Sep 9, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.

Centennial · AQI 34 (Good)

Dark green marks tree cover detected inside the study radius.Sentinel-2 L2A (ESA Copernicus) via Earth Search, captured Sep 9, 2026

Centennial's tree count comes to 59,062 trees across 4.9 sq mi (12.57 km²), 11 points below the 30% tree-cover level considered healthy for this area, so roughly 35,186 more trees would close the gap.

Air quality detail

Air quality in Centennial today: AQI 34, Good

Main pollutant: Ozone · Observed Nov 11, 08:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.

Ground station · Smoky Hill Library, 5.6 mi (9 km) away · median of 3 stations

Health signal

Air quality is satisfactory for everyone.

PM2.5

2.9

PM10

—

NO₂

—

O₃

74.6

SO₂

—

CO

—

Data: OpenAQ · AirGradient, AirNow, Clarity, HDG

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 Centennial's daily AQI at 52 on average, from 47 on Nov 8 to an hourly peak of 81 on Nov 5.

Last 7 days · model estimateavg 52 · peak 81
Nov 4: AQI 50 (peak 72)Nov 5: AQI 58 (peak 81)Nov 6: AQI 53 (peak 75)Nov 7: AQI 49 (peak 74)Nov 8: AQI 47 (peak 69)Nov 9: AQI 49 (peak 63)Nov 10: AQI 60 (peak 63)
Nov 4Nov 10

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

Tree cover detail

Tree cover in Centennial: Below target

18.8% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).

11 points below target

Trees in this area

59,062

Target trees

94,248

More trees needed

35,186

CO₂ if planted / yr

774.1 t

Deforestation · 2001–2025

How much forest has Centennial lost?

Since 2001, the area within 10 km of Centennial has lost about 4 acres (2 hectares) of forest: 1.1% of the forest it had in 2000. The biggest cause was towns and roads (28%). Almost none of it was deforestation, meaning forest cleared for good.

Satellite image of the area around Centennial, June 2017

2017: satellite photo from June 2017 of a 5 × 5 km area in the city center.

Forest lost since 2001
4 acres (2 ha)
Share of its forest
1.1%of what there was in 2000
Cleared for good
under 1 hadeforestation: turned into farms, mines or towns
Forest lost each year around Centennial, 2001–2025

Acres of forest lost each year

Forest lost each year around Centennial, 2001–2025. Use the left and right arrow keys to read each year.0.988

Show the figures as a table
Forest lost each year around Centennial, 2001–2025
YearCleared for goodCan grow backTotal
2001under 1 haunder 1 haunder 1 ha
2002under 1 haunder 1 haunder 1 ha
2003under 1 haunder 1 haunder 1 ha
2004under 1 haunder 1 haunder 1 ha
2005under 1 haunder 1 haunder 1 ha
2006under 1 haunder 1 haunder 1 ha
2007under 1 haunder 1 haunder 1 ha
2008under 1 haunder 1 haunder 1 ha
2009under 1 haunder 1 haunder 1 ha
2010under 1 haunder 1 haunder 1 ha
2011under 1 haunder 1 haunder 1 ha
2012under 1 haunder 1 haunder 1 ha
2013under 1 haunder 1 haunder 1 ha
2014under 1 haunder 1 haunder 1 ha
2015under 1 haunder 1 haunder 1 ha
2016under 1 haunder 1 haunder 1 ha
2017under 1 haunder 1 haunder 1 ha
2018under 1 haunder 1 haunder 1 ha
2019under 1 haunder 1 haunder 1 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
2024under 1 haunder 1 haunder 1 ha
2025under 1 haunder 1 haunder 1 ha

What is causing deforestation around Centennial?

  • Towns and roadscleared for good28% · under 1 ha
  • Unknown causescause unknown72% · 3 acres (1 ha)

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
8,580 acres (3,470 ha)
Forest in 2020
11,000 acres (4,440 ha)
Overall change
+2,390 acres (969 ha)more forest than in 2000

Comparing satellite maps from 2000 and 2020, the forest around Centennial grew from about 8,580 acres (3,470 hectares) to 11,000 acres (4,440 hectares), a net gain of about 2,390 acres (969 hectares) (+28%). New forest grew on about 2,420 acres (980 hectares), while 26 acres (10 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 Centennial

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

  • Aurora

    United States

    17.1 km
    Tree cover
    14%
    Air quality
    23
  • Denver

    United States

    20.0 km
    Tree cover
    13%
    Air quality
    29
  • Lakewood

    United States

    22.4 km
    Tree cover
    27%
    Air quality
    32
  • Arvada

    United States

    30.7 km
    Tree cover
    21%
    Air quality
    32
  • Thornton

    United States

    33.1 km
    Tree cover
    10%
    Air quality
    132
  • Boulder

    United States

    59.0 km
    Tree cover
    38%
    Air quality
    14

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

Questions about Centennial

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

The latest reading for Centennial shows an AQI of 34 (Good), measured Nov 11, 08:00 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Smoky Hill Library, 5.6 mi (9 km) away). The main pollutant is Ozone. Air quality is satisfactory for everyone.

Is it safe to exercise outside in Centennial today?

At AQI 34 (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 Centennial been like this week?

Over the last 7 days, the CAMS air-quality model put Centennial's daily AQI at 52 on average, from 47 on Nov 8 to an hourly peak of 81 on Nov 5. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.

How much forest has the area around Centennial lost since 2001?

Since 2001, the area within 10 km of Centennial has lost about 4 acres (2 hectares) of forest: 1.1% of the forest it had in 2000. The biggest cause was towns and roads (28%). Almost none of it was deforestation, meaning forest cleared for good. Comparing satellite maps from 2000 and 2020, the forest around Centennial grew from about 8,580 acres (3,470 hectares) to 11,000 acres (4,440 hectares), a net gain of about 2,390 acres (969 hectares) (+28%). New forest grew on about 2,420 acres (980 hectares), while 26 acres (10 hectares) were lost.

What is the tree count in Centennial?

Centennial has an estimated 59,062 trees across the 4.9 sq mi (12.57 km²) measured — 18.8% tree cover, 11 percentage points short of the 30% tree-cover target set for this area.

How many more trees does Centennial need?

Centennial needs roughly 35,186 more trees to close a 11-point shortfall against its 30% tree-cover target — about 774.1 t of extra CO₂ absorbed per year once grown.

How are Centennial's air quality and tree cover measured?

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

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