City report · Nghệ An Province, Vietnam
Hoàng Mai Air quality today
Air quality in Hoàng Mai currently reads AQI 31 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 31
Good
- PM2.5, fine particles (µg/m³)
- 5.4
- tree cover
- 41.2%
- trees in this area
- 127K
- more trees needed
- 0
Measured across a 2 km radius around Tân Tiến, Quỳnh Thiện, Hoàng Mai, Nghệ An, Vietnam (12.57 km²), from a satellite image of Sep 4, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hoàng Mai · AQI 31 (Good)
Hoàng Mai's tree count comes to 127,492 trees across 12.38 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Hoàng Mai today: AQI 31, Good
Main pollutant: PM2.5 · Observed Nov 11, 05:00 local time via Open-Meteo / CAMS, corrected with 7 ground-station cities within 205 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 7 station cities within 205 km, e.g. Song Tri and Duong Hao
Health signal
Air quality is satisfactory for everyone.
PM2.5
5.4
PM10
10.9
NO₂
12.5
O₃
45.0
SO₂
12.5
CO
332.0
- 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 Hoàng Mai's daily AQI at 49 on average, from 42 on Nov 10 to an hourly peak of 79 on Nov 5.
Where Hoàng Mai stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hoàng Mai: Healthy tree cover
41.2% tree cover against a 30% healthy-neighborhood target, across 12.38 km² of land.
Trees in this area
127,492
Target trees
127,492
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Hoàng Mai lost?
Since 2001, the area within 10 km of Hoàng Mai has lost about 3,470 hectares of forest (about 4,900 football pitches): 53% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 76 hectares (2.2%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from December 2017 of a 5 × 5 km area about 7 km northwest of the city center.
- Forest lost since 2001
- 3,470 haabout 4,900 football pitches
- Share of its forest
- 53%of what there was in 2000
- Cleared for good
- 76 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 151 hectares a year in 2021–2025, down from 330 hectares a year in 2016–2020. The worst year was 2017, when about 546 hectares of forest were lost.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | under 1 ha | 7 ha | 8 ha |
| 2002 | under 1 ha | 7 ha | 8 ha |
| 2003 | 3 ha | 85 ha | 88 ha |
| 2004 | under 1 ha | 44 ha | 45 ha |
| 2005 | 2 ha | 119 ha | 121 ha |
| 2006 | 3 ha | 37 ha | 40 ha |
| 2007 | 6 ha | 35 ha | 41 ha |
| 2008 | 2 ha | 32 ha | 34 ha |
| 2009 | 12 ha | 48 ha | 60 ha |
| 2010 | 3 ha | 87 ha | 90 ha |
| 2011 | 3 ha | 61 ha | 64 ha |
| 2012 | under 1 ha | 61 ha | 62 ha |
| 2013 | under 1 ha | 85 ha | 85 ha |
| 2014 | 2 ha | 113 ha | 114 ha |
| 2015 | 4 ha | 203 ha | 207 ha |
| 2016 | 3 ha | 477 ha | 480 ha |
| 2017 | 4 ha | 543 ha | 546 ha |
| 2018 | 4 ha | 338 ha | 342 ha |
| 2019 | under 1 ha | 158 ha | 158 ha |
| 2020 | 1 ha | 124 ha | 125 ha |
| 2021 | 3 ha | 158 ha | 161 ha |
| 2022 | under 1 ha | 98 ha | 99 ha |
| 2023 | 7 ha | 157 ha | 164 ha |
| 2024 | 7 ha | 146 ha | 153 ha |
| 2025 | 5 ha | 175 ha | 180 ha |
What is causing deforestation around Hoàng Mai?
- Loggingcan grow back98% · 3,400 ha
Also: mining and energy, towns and roads, farms, pasture and plantations, 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
- 10,600 ha
- Forest in 2020
- 10,400 ha
- Overall change
- −161 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hoàng Mai stayed about the same size, at about 10,400 hectares: new forest grew on about 1,570 hectares, and about 1,730 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
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Frequently asked
Questions about Hoàng Mai
What is the air quality (AQI) in Hoàng Mai right now?
The latest reading for Hoàng Mai shows an AQI of 31 (Good), observed Nov 11, 05:00 local time via Open-Meteo / CAMS, corrected with 7 ground-station cities within 205 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Hoàng Mai today?
At AQI 31 (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 Hoàng Mai been like this week?
Over the last 7 days, the CAMS air-quality model put Hoàng Mai's daily AQI at 49 on average, from 42 on Nov 10 to an hourly peak of 79 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 Hoàng Mai lost since 2001?
Since 2001, the area within 10 km of Hoàng Mai has lost about 3,470 hectares of forest (about 4,900 football pitches): 53% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 76 hectares (2.2%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss is slowing down: about 151 hectares a year in 2021–2025, down from 330 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Hoàng Mai stayed about the same size, at about 10,400 hectares: new forest grew on about 1,570 hectares, and about 1,730 hectares were lost.
What is the tree count in Hoàng Mai?
Hoàng Mai has an estimated 127,492 trees across the 12.38 km² of land measured — 41.2% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Hoàng Mai need?
Hoàng Mai has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Hoàng Mai's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search satellite imagery at 10 m detail across a 2 km radius around Tân Tiến; the tree count is an estimate derived from that cover.
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