City report · Thanh Hóa Province, Vietnam
Nghi Sơn Air quality today
Air quality in Nghi Sơn currently reads AQI 49 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 49
Good
- PM2.5, fine particles (µg/m³)
- 8.7
- tree cover
- 46.0%
- trees in this area
- 59.5K
- more trees needed
- 0
Measured across a 2 km radius around Nghi Son, Thanh Hoa, Vietnam (12.57 km²), from a satellite image of Sep 9, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Nghi Sơn · AQI 49 (Good)
Nghi Sơn's tree count comes to 59,539 trees across 5.18 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Nghi Sơn today: AQI 49, Good
Main pollutant: PM2.5 · Observed Nov 11, 16:00 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
8.7
PM10
20.7
NO₂
5.3
O₃
123.0
SO₂
8.8
CO
303.0
- 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 Nghi Sơn's daily AQI at 45 on average, from 29 on Nov 5 to an hourly peak of 69 on Nov 9.
Where Nghi Sơn stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Nghi Sơn: Healthy tree cover
46.0% tree cover against a 30% healthy-neighborhood target, across 5.18 km² of land.
Trees in this area
59,539
Target trees
59,539
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Nghi Sơn lost?
Since 2001, the area within 10 km of Nghi Sơn has lost about 1,400 hectares of forest (about 2,000 football pitches): 37% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 124 hectares (8.8%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from December 2017 of a 5 × 5 km area about 5 km southwest of the city center.
- Forest lost since 2001
- 1,400 haabout 2,000 football pitches
- Share of its forest
- 37%of what there was in 2000
- Cleared for good
- 124 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 93 hectares a year in 2021–2025, down from 133 hectares a year in 2016–2020. The worst year was 2017, when about 206 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 | 1 ha | 1 ha |
| 2002 | under 1 ha | 1 ha | 2 ha |
| 2003 | under 1 ha | 12 ha | 12 ha |
| 2004 | under 1 ha | 11 ha | 11 ha |
| 2005 | 3 ha | 39 ha | 42 ha |
| 2006 | 2 ha | 10 ha | 11 ha |
| 2007 | 2 ha | 12 ha | 15 ha |
| 2008 | 3 ha | 20 ha | 23 ha |
| 2009 | 5 ha | 31 ha | 36 ha |
| 2010 | 4 ha | 17 ha | 20 ha |
| 2011 | 3 ha | 13 ha | 16 ha |
| 2012 | 1 ha | 11 ha | 12 ha |
| 2013 | under 1 ha | 11 ha | 12 ha |
| 2014 | 1 ha | 28 ha | 29 ha |
| 2015 | 3 ha | 30 ha | 33 ha |
| 2016 | 5 ha | 120 ha | 125 ha |
| 2017 | 13 ha | 193 ha | 206 ha |
| 2018 | 10 ha | 186 ha | 196 ha |
| 2019 | 5 ha | 79 ha | 84 ha |
| 2020 | 7 ha | 46 ha | 53 ha |
| 2021 | 2 ha | 91 ha | 93 ha |
| 2022 | 8 ha | 42 ha | 50 ha |
| 2023 | 24 ha | 67 ha | 91 ha |
| 2024 | 6 ha | 99 ha | 105 ha |
| 2025 | 16 ha | 109 ha | 125 ha |
What is causing deforestation around Nghi Sơn?
- Loggingcan grow back89% · 1,240 ha
- Mining and energycleared for good5.8% · 82 ha
- Wildfirescan grow back2.4% · 34 ha
Also: farms, pasture and plantations, towns and roads, 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
- 5,260 ha
- Forest in 2020
- 4,840 ha
- Overall change
- −416 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Nghi Sơn shrank from about 5,260 hectares to 4,840 hectares, a net loss of about 416 hectares (−7.9%). New forest grew on about 345 hectares, but 761 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 Nghi Sơn
What is the air quality (AQI) in Nghi Sơn right now?
The latest reading for Nghi Sơn shows an AQI of 49 (Good), observed Nov 11, 16:00 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 Nghi Sơn today?
At AQI 49 (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 Nghi Sơn been like this week?
Over the last 7 days, the CAMS air-quality model put Nghi Sơn's daily AQI at 45 on average, from 29 on Nov 5 to an hourly peak of 69 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 Nghi Sơn lost since 2001?
Since 2001, the area within 10 km of Nghi Sơn has lost about 1,400 hectares of forest (about 2,000 football pitches): 37% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 124 hectares (8.8%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss is slowing down: about 93 hectares a year in 2021–2025, down from 133 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Nghi Sơn shrank from about 5,260 hectares to 4,840 hectares, a net loss of about 416 hectares (−7.9%). New forest grew on about 345 hectares, but 761 hectares were lost.
What is the tree count in Nghi Sơn?
Nghi Sơn has an estimated 59,539 trees across the 5.18 km² of land measured — 46.0% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Nghi Sơn need?
Nghi Sơn has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Nghi Sơn'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 Nghi Son; the tree count is an estimate derived from that cover.
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