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City report · Oregon, United States

Hillsboro Air quality today

Air quality in Hillsboro currently reads AQI 43 (Good): Air quality is satisfactory for everyone.

Air quality right now

AQI 43

Good

Main pollutant: PM2.5
PM2.5, fine particles (µg/m³)
7.8
tree cover
40.5%
trees in this area
127K
more trees needed
0

Measured across a 1.2 mi (2 km) radius around Hillsboro, OR, USA (4.9 sq mi), from a satellite image of Sep 8, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.

Hillsboro · AQI 43 (Good)

Dark green marks tree cover detected inside the study radius.Sentinel-2 L2A (ESA Copernicus) via Earth Search, captured Sep 8, 2026

Hillsboro's tree count comes to 126,980 trees across 4.8 sq mi (12.54 km²) of land, already at or above the 30% tree-cover level considered healthy for this area.

Air quality detail

Air quality in Hillsboro today: AQI 43, Good

Main pollutant: PM2.5 · Observed Nov 11, 06:05 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.

Ground station · NE Grant St Collocation, 0.9 mi (1.5 km) away

Health signal

Air quality is satisfactory for everyone.

PM2.5

7.8

PM10

—

NO₂

—

O₃

—

SO₂

—

CO

—

Data: OpenAQ · Clarity

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 Hillsboro's daily AQI at 53 on average, from 15 on Nov 10 to an hourly peak of 116 on Nov 8.

Last 7 days · model estimateavg 53 · peak 116
Nov 4: AQI 76 (peak 91)Nov 5: AQI 47 (peak 82)Nov 6: AQI 59 (peak 83)Nov 7: AQI 52 (peak 71)Nov 8: AQI 59 (peak 116)Nov 9: AQI 63 (peak 106)Nov 10: AQI 15 (peak 18)
Nov 4Nov 10

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

Tree cover detail

Tree cover in Hillsboro: Healthy tree cover

40.5% tree cover against a 30% healthy-neighborhood target, across 4.8 sq mi (12.54 km²) of land.

Target reached

Trees in this area

126,980

Target trees

126,980

More trees needed

0

CO₂ if planted / yr

0 kg

Deforestation · 2001–2025

How much forest has Hillsboro lost?

Since 2001, the area within 10 km of Hillsboro has lost about 1,770 acres (717 hectares) of forest (about 1,300 football fields): 16% of the forest it had in 2000. Most of it (71%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.

Satellite image of the area around Hillsboro, August 2017

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

Forest lost since 2001
1,770 acres (717 ha)about 1,300 football fields
Share of its forest
16%of what there was in 2000
Cleared for good
1,260 acres (509 ha)deforestation: turned into farms, mines or towns

The worst year was 2017, when about 191 acres (77 hectares) of forest were lost.

Forest lost each year around Hillsboro, 2001–2025

Acres of forest lost each year

Forest lost each year around Hillsboro, 2001–2025. Use the left and right arrow keys to read each year.191

Show the figures as a table
Forest lost each year around Hillsboro, 2001–2025
YearCleared for goodCan grow backTotal
200125 acres (10 ha)under 1 ha26 acres (11 ha)
200220 acres (8 ha)under 1 ha22 acres (9 ha)
200325 acres (10 ha)26 acres (11 ha)51 acres (21 ha)
200437 acres (15 ha)37 acres (15 ha)74 acres (30 ha)
200557 acres (23 ha)77 acres (31 ha)135 acres (55 ha)
200662 acres (25 ha)52 acres (21 ha)114 acres (46 ha)
200787 acres (35 ha)33 acres (13 ha)119 acres (48 ha)
200834 acres (14 ha)10 acres (4 ha)44 acres (18 ha)
200946 acres (18 ha)under 1 ha46 acres (19 ha)
201020 acres (8 ha)3 acres (1 ha)23 acres (9 ha)
201131 acres (13 ha)under 1 ha33 acres (14 ha)
201265 acres (26 ha)33 acres (14 ha)98 acres (40 ha)
201311 acres (5 ha)6 acres (2 ha)17 acres (7 ha)
201415 acres (6 ha)under 1 ha17 acres (7 ha)
201540 acres (16 ha)13 acres (5 ha)53 acres (21 ha)
2016122 acres (49 ha)26 acres (11 ha)148 acres (60 ha)
2017123 acres (50 ha)68 acres (28 ha)191 acres (77 ha)
201847 acres (19 ha)5 acres (2 ha)53 acres (21 ha)
201935 acres (14 ha)11 acres (4 ha)46 acres (19 ha)
2020101 acres (41 ha)7 acres (3 ha)107 acres (44 ha)
202151 acres (21 ha)8 acres (3 ha)59 acres (24 ha)
202295 acres (39 ha)20 acres (8 ha)115 acres (47 ha)
202342 acres (17 ha)25 acres (10 ha)66 acres (27 ha)
202433 acres (13 ha)under 1 ha34 acres (14 ha)
202536 acres (15 ha)42 acres (17 ha)78 acres (31 ha)

What is causing deforestation around Hillsboro?

  • Farms, pasture and plantationscleared for good49% · 862 acres (349 ha)
  • Loggingcan grow back27% · 470 acres (190 ha)
  • Towns and roadscleared for good22% · 395 acres (160 ha)

Also: storms, floods and other natural causes, 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
18,900 acres (7,660 ha)
Forest in 2020
19,200 acres (7,770 ha)
Overall change
+274 acres (111 ha)more forest than in 2000

Comparing satellite maps from 2000 and 2020, the forest around Hillsboro stayed about the same size, at about 19,200 acres (7,770 hectares): new forest grew on about 1,690 acres (683 hectares), and about 1,410 acres (572 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 Hillsboro

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

  • Portland

    United States

    24.4 km
    Tree cover
    21%
    Air quality
    44
  • Vancouver

    United States

    28.6 km
    Tree cover
    36%
    Air quality
    48
  • Gresham

    United States

    43.6 km
    Tree cover
    48%
    Air quality
    9
  • Salem

    United States

    64.6 km
    Tree cover
    42%
    Air quality
    51
  • Eugene

    United States

    163.7 km
    Tree cover
    37%
    Air quality
    64
  • Tacoma

    United States

    196.9 km
    Tree cover
    19%
    Air quality
    38

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

Questions about Hillsboro

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

The latest reading for Hillsboro shows an AQI of 43 (Good), measured Nov 11, 06:05 local time by the NE Grant St Collocation ground monitoring station, 0.9 mi (1.5 km) away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.

Is it safe to exercise outside in Hillsboro today?

At AQI 43 (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 Hillsboro been like this week?

Over the last 7 days, the CAMS air-quality model put Hillsboro's daily AQI at 53 on average, from 15 on Nov 10 to an hourly peak of 116 on Nov 8. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.

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

Since 2001, the area within 10 km of Hillsboro has lost about 1,770 acres (717 hectares) of forest (about 1,300 football fields): 16% of the forest it had in 2000. Most of it (71%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Comparing satellite maps from 2000 and 2020, the forest around Hillsboro stayed about the same size, at about 19,200 acres (7,770 hectares): new forest grew on about 1,690 acres (683 hectares), and about 1,410 acres (572 hectares) were lost.

What is the tree count in Hillsboro?

Hillsboro has an estimated 126,980 trees across the 4.8 sq mi (12.54 km²) of land measured — 40.5% tree cover, already past the 30% tree-cover target set for this area.

How many more trees does Hillsboro need?

Hillsboro has already reached its tree-cover target, so no additional trees are needed to close the gap.

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

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

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