Air quality comparison · Vietnam, 1208 km apart
Cần Thơ vs Haiphong Air quality index (AQI) today
Cần Thơ has cleaner air than Haiphong right now: AQI 16 (Good) against 46 (Good).
Both sit in the same EPA band, so the health advice is the same for each today. But over the past 6 days, on modeled daily averages, Haiphong averaged AQI 48 against 71, and it was the cleaner of the two on 6 of those days. Haiphong has lost more forest since 2001. Cần Thơ has more tree cover.
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Cần Thơ16Haiphong46
Head to head
Cần Thơ vs Haiphong at a glance
Cần Thơ is ahead on 5 of 6 measures, and Haiphong on 1. The better figure in each row is marked.
| Cần Thơ | Haiphong | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 16 (better) | 46 |
| PM2.5Fine particles, µg/m³. | 2.4 (better) | 8.2 |
| Past week's averageUS AQI, 6 days. | 71 | 48 (better) |
| Forest lost since 2001Within 10 km of the center. | 50 ha (better) | 132 ha |
| Tree coverWithin 2 km of the center. | 22.0% (better) | 19.4% |
| Trees still neededTo reach a healthy canopy. | 19.6K (better) | 27.5K |
Air quality today
What is the air like in Cần Thơ and Haiphong right now?
Cần Thơ has cleaner air than Haiphong right now: AQI 16 (Good) against 46 (Good). PM2.5 is setting the index in both.
Haiphong is read from a nearby ground station and Cần Thơ is a model estimate, so the two are not quite like for like.
Cần ThơHaiphong
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).
Cần Thơ: Estimate · model corrected with 4 station cities within 145 km, e.g. Can Giuoc and Ho Chi Minh City. Data: Open-Meteo / CAMS, corrected with 4 ground-station cities within 145 km, US EPA index.
Haiphong: Ground station · Quảng Ninh/K11 - Minh Thành, Vietnam, 24.1 km away. Data: World Air Quality Index Project, Vietnam Center For Environmental Monitoring Portal (cổng thông tin quan trắc môi trường).
The past week
Which had cleaner air over the past 6 days?
But over the past 6 days, on modeled daily averages, Haiphong averaged AQI 48 against 71, and it was the cleaner of the two on 6 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
- Cần Thơ0Haiphong6
- Average AQI
- Cần Thơ71Haiphong48
- Worst day, AQI
- Cần Thơ76Haiphong51
The daily numbers (6 days)
| Day | Cần Thơ | Haiphong |
|---|---|---|
| Nov 5 | 69 | 49 |
| Nov 6 | 70 | 50 |
| Nov 7 | 76 | 51 |
| Nov 8 | 71 | 47 |
| Nov 9 | 70 | 43 |
| Nov 10 | 70 | 45 |
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 Cần Thơ and Haiphong today?
Air quality is satisfactory for everyone. Both are in the same EPA band today (Good), so the advice is the same.
Exercise outdoors
A good day to be active outside.
Windows
Open them to air the house.
Masks
Not needed.
Air purifier
Not needed.
Against everywhere else
How do Cần Thơ and Haiphong compare with the rest of the world?
Right now Cần Thơ's air is cleaner than 92% of the 5,420 places Airleaf tracks, and Haiphong's is cleaner than 65%. Within Vietnam, that is 64% and 34% of its 114 measured places.
Cleaner air than…
- Cần Thơ
- Beats 92%
- Haiphong
- Beats 65%
More tree cover than…
- Cần Thơ
- Beats 51%
- Haiphong
- Beats 45%
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, Cần Thơ or Haiphong?
Haiphong has lost more: about 132 ha of forest within 10 km of its center from 2001 to 2025, against 50 ha around Cần Thơ. 72 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: 2010, with 8 ha lost.
Worst year: 2001, with 33 ha lost.
| Cần Thơ | Haiphong | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 50 ha (better) | 132 ha |
| Share of its forestOf what it had in 2000. | 2.7% (better) | 14% |
| Cleared for goodTurned into farms, mines or towns. | 30 ha (better) | 72 ha |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Towns and roads (35%) | Towns and roads (54%) |
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.
Cần Thơ
2017: satellite photo from March 2017 of a 5 × 5 km area in the city center.
Haiphong
2017: satellite photo from October 2017 of a 5 × 5 km area in the city center.
Trees
Which has more trees, Cần Thơ or Haiphong?
Cần Thơ has more tree cover: 22.0% of the land within 2 km of its center against 19.4% around Haiphong, or about 53,910 trees against 50,281.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Cần Thơ | Haiphong | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 53.9K (better) | 50.3K |
| Trees still neededTo reach the target. Fewer is better. | 19.6K (better) | 27.5K |
| CO₂ absorbed each yearBy the trees already standing. | 1.2M kg (better) | 1.1M 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
Cần Thơ vs Haiphong: your questions answered
Is Cần Thơ cleaner than Haiphong?
On air quality, yes, right now: Cần Thơ reads AQI 16 against 46, a gap of 30 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 6 days, on modeled daily averages, Haiphong averaged AQI 48 against 71, and it was the cleaner of the two on 6 of those days.
Is it safe to exercise outdoors in Cần Thơ and Haiphong today?
The advice is the same for both today. Air quality is satisfactory for everyone. Cần Thơ reads AQI 16 and Haiphong reads AQI 46.
Which has lost more forest, Cần Thơ or Haiphong?
Haiphong has lost more: about 132 ha of forest within 10 km of its center from 2001 to 2025, against 50 ha around Cần Thơ. 72 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Cần Thơ or Haiphong?
Cần Thơ has more tree cover: 22.0% of the land within 2 km of its center against 19.4% around Haiphong, or about 53,910 trees against 50,281. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Cần Thơ and Haiphong need?
Cần Thơ needs about 19,604 more to reach its canopy target of 30%, and Haiphong about 27,473 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Are Cần Thơ and Haiphong 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. Haiphong is read from a nearby ground station and Cần Thơ is a model estimate, so the two are not quite like for like. Nothing is adjusted for population, city limits or climate.
How often does the Cần Thơ vs Haiphong 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 (Apr 24, 2026 and Sep 11, 2026), and the forest figures are published yearly.
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