Air quality comparison · Vietnam, 43 km apart
Hà Tĩnh vs Vinh Air quality index (AQI) today
Vinh has cleaner air than Hà Tĩnh right now: AQI 59 (Moderate) against 67 (Moderate).
Both sit in the same EPA band, so the health advice is the same for each today. But over the past 7 days, on modeled daily averages, Hà Tĩnh averaged AQI 51 against 56, and it was the cleaner of the two on 4 of those days. Hà Tĩnh has lost more forest since 2001. Hà Tĩnh has more tree cover.
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Hà Tĩnh67Vinh59
Head to head
Hà Tĩnh vs Vinh at a glance
Hà Tĩnh and Vinh are level, each ahead on 3 of 6 measures. The better figure in each row is marked.
| Hà Tĩnh | Vinh | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 67 | 59 (better) |
| PM2.5Fine particles, µg/m³. | 18.6 | 12.2 (better) |
| Past week's averageUS AQI, 7 days. | 51 (better) | 56 |
| Forest lost since 2001Within 10 km of the center. | 271 ha | 209 ha (better) |
| Tree coverWithin 2 km of the center. | 19.7% (better) | 19.1% |
| Trees still neededTo reach a healthy canopy. | 31.5K (better) | 34.1K |
Air quality today
What is the air like in Hà Tĩnh and Vinh right now?
Vinh has cleaner air than Hà Tĩnh right now: AQI 59 (Moderate) against 67 (Moderate). PM2.5 is setting the index in both.
Hà Tĩnh's PM2.5 is about 1.2× the WHO's 24-hour guideline of 15 µg/m³.
Both readings are model estimates, with no ground station close enough to either.
Hà TĩnhVinh
Concentrations at the same moment as the index above, for the pollutants both places report. Lower is better. The dark marks on the PM2.5 and PM10 rows show the WHO's 24-hour guidelines (15 and 45 µg/m³).
Hà Tĩnh: Estimate · model corrected with 3 station cities within 245 km, e.g. Song Tri and Thakhek. Data: Open-Meteo / CAMS, corrected with 3 ground-station cities within 245 km, US EPA index.
Vinh: Estimate · model corrected with 2 station cities within 185 km, e.g. Song Tri and Thakhek. Data: Open-Meteo / CAMS, corrected with 2 ground-station cities within 185 km, US EPA index.
The past week
Which had cleaner air over the past 7 days?
But over the past 7 days, on modeled daily averages, Hà Tĩnh averaged AQI 51 against 56, and it was the cleaner of the two on 4 of those days. A single reading can catch a city on a bad afternoon; the week says whether it was the weather or the place.
- Cleaner days
- Hà Tĩnh4Vinh3
- Average AQI
- Hà Tĩnh51Vinh56
- Worst day, AQI
- Hà Tĩnh57Vinh70
The daily numbers (7 days)
| Day | Hà Tĩnh | Vinh |
|---|---|---|
| Nov 5 | 51 | 70 |
| Nov 6 | 48 | 59 |
| Nov 7 | 49 | 59 |
| Nov 8 | 51 | 56 |
| Nov 9 | 50 | 49 |
| Nov 10 | 54 | 46 |
| Nov 11 | 57 | 54 |
Daily averages from the CAMS atmospheric model for both places, so the week compares like with like. They can differ from today's reading at the top of the page wherever that comes from a ground station.
What it means today
Is it safe to go outside in Hà Tĩnh and Vinh today?
Unusually sensitive people should consider limiting long outdoor exertion. Both are in the same EPA band today (Moderate), so the advice is the same.
Exercise outdoors
Fine for most people; unusually sensitive people should take long or hard exercise easier.
Windows
Fine to open; close them if you are sensitive to pollution.
Masks
Not needed for most people.
Air purifier
Worth running if you are sensitive.
Against everywhere else
How do Hà Tĩnh and Vinh compare with the rest of the world?
Right now Hà Tĩnh's air is cleaner than 40% of the 5,420 places Airleaf tracks, and Vinh's is cleaner than 48%. Within Vietnam, that is 12% and 19% of its 114 measured places.
Cleaner air than…
- Hà Tĩnh
- Beats 40%
- Vinh
- Beats 48%
More tree cover than…
- Hà Tĩnh
- Beats 46%
- Vinh
- Beats 44%
Includes model estimates as well as station readings, so it can differ from our most polluted and cleanest air rankings, which use station readings only.
Deforestation · 2001–2025
Which has lost more forest, Hà Tĩnh or Vinh?
Hà Tĩnh has lost more: about 271 ha of forest within 10 km of its center from 2001 to 2025, against 209 ha around Vinh. 35 ha of that was cleared for good, for farms, mines or towns.
Measured within 10 km of each center, from the yearly satellite maps of forest loss: a wider circle than the one for tree cover, because forest is usually lost at a city's edges.
Worst year: 2015, with 24 ha lost.
Worst year: 2025, with 46 ha lost.
| Hà Tĩnh | Vinh | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 271 ha | 209 ha (better) |
| Share of its forestOf what it had in 2000. | 16% (better) | 16% |
| Cleared for goodTurned into farms, mines or towns. | 35 ha (better) | 76 ha |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Logging (80%) | Logging (57%) |
Satellite timelapses
Watch both change, year by year
A clear satellite photo a year of the land around each city. Press play, turn on the forest cleared since the first year, or drag the before and after.
Hà Tĩnh
2017: satellite photo from May 2017 of a 5 × 5 km area about 7 km southwest of the city center.
Vinh
2017: satellite photo from April 2017 of a 5 × 5 km area about 7 km south of the city center.
Trees
Which has more trees, Hà Tĩnh or Vinh?
Hà Tĩnh has more tree cover: 19.7% of the land within 2 km of its center against 19.1% around Vinh, or about 60,156 trees against 59,824.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Hà Tĩnh | Vinh | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 60.2K (better) | 59.8K |
| Trees still neededTo reach the target. Fewer is better. | 31.5K (better) | 34.1K |
| CO₂ absorbed each yearBy the trees already standing. | 1.3M kg (better) | 1.3M kg |
Tree cover on the satellite image
The same 2 km radius around each center, with the tree cover the satellite found marked on it.
Reading these numbers
How this comparison is made
Air quality index
The US EPA index, computed from current pollutant concentrations: ground stations where a place has them nearby, and the CAMS atmospheric model everywhere else. It moves hour to hour, so it is a snapshot rather than a verdict on either place. The guideline marks are from the WHO's 2021 air quality guidelines.
Trees and forest
Tree cover is the share of ground under canopy within 2 km of each center, read from Sentinel-2 satellite imagery at 10 m detail. It measures that circle, not the whole municipality, which is what makes the two comparable. Forest loss comes from the University of Maryland's Global Forest Change maps.
More on the method on the About Airleaf page.
Frequently asked
Hà Tĩnh vs Vinh: your questions answered
Is Vinh cleaner than Hà Tĩnh?
On air quality, yes, right now: Vinh reads AQI 59 against 67, a gap of 8 points on the US EPA index. This is a live reading rather than an annual average, so it can reverse within a day. But over the past 7 days, on modeled daily averages, Hà Tĩnh averaged AQI 51 against 56, and it was the cleaner of the two on 4 of those days.
Is it safe to exercise outdoors in Hà Tĩnh and Vinh today?
The advice is the same for both today. Unusually sensitive people should consider limiting long outdoor exertion. Hà Tĩnh reads AQI 67 and Vinh reads AQI 59.
Which has lost more forest, Hà Tĩnh or Vinh?
Hà Tĩnh has lost more: about 271 ha of forest within 10 km of its center from 2001 to 2025, against 209 ha around Vinh. 35 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Hà Tĩnh or Vinh?
Hà Tĩnh has more tree cover: 19.7% of the land within 2 km of its center against 19.1% around Vinh, or about 60,156 trees against 59,824. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Hà Tĩnh and Vinh need?
Hà Tĩnh needs about 31,452 more to reach its canopy target of 30%, and Vinh about 34,141 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Why can two places 43 km apart read differently?
Air changes over short distances with traffic, industry, wind and hills, and each reading comes from the nearest ground stations or, where there are none, from a regional model. A gap of a few points between neighbors is within normal variation, while a gap that crosses an EPA band is worth noticing.
Are Hà Tĩnh and Vinh measured the same way?
The method is the same: the US EPA index for air, and Sentinel-2 satellite imagery at 10 m detail over an identical radius for trees. Both readings are model estimates, with no ground station close enough to either. Nothing is adjusted for population, city limits or climate.
How often does the Hà Tĩnh vs Vinh comparison update?
The air readings refresh about once an hour, and each reading's local time is shown at the top of the page. Tree cover comes from the latest clear satellite image of each area (Sep 21, 2026 and Jun 1, 2026), and the forest figures are published yearly.
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