Air quality comparison · Vietnam, 89 km apart
Haiphong vs Hanoi Air quality index (AQI) today
Haiphong has cleaner air than Hanoi right now: AQI 61 (Moderate) against 154 (Unhealthy).
That puts them in different EPA bands, so the health advice differs today. 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. Haiphong has more tree cover.
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Haiphong61Hanoi154
Head to head
Haiphong vs Hanoi at a glance
Haiphong is ahead on 5 of 6 measures, and Hanoi on 1. The better figure in each row is marked.
| Haiphong | Hanoi | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 61 (better) | 154 |
| PM2.5Fine particles, µg/m³. | 14.5 (better) | 59.9 |
| Past week's averageUS AQI, 6 days. | 48 (better) | 71 |
| Forest lost since 2001Within 10 km of the center. | 132 ha | 11 ha (better) |
| Tree coverWithin 2 km of the center. | 19.4% (better) | 18.7% |
| Trees still neededTo reach a healthy canopy. | 27.5K (better) | 65.6K |
Air quality today
What is the air like in Haiphong and Hanoi right now?
Haiphong has cleaner air than Hanoi right now: AQI 61 (Moderate) against 154 (Unhealthy). PM2.5 is setting the index in both.
Hanoi's PM2.5 is about 4.0× the WHO's 24-hour guideline of 15 µg/m³.
Both readings come from nearby ground stations.
HaiphongHanoi
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).
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).
Hanoi: Ground station · Số 1 đường Giải Phóng - phường Bạch Mai - ĐHBK , 2.1 km away · median of 3 stations. Data: OpenAQ · Hanoi Air Quality Monitoring Network, World Air Quality Index Project, UNIS - United Nations International School Of Hanoi.
The past week
Which had cleaner air over the past 6 days?
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
- Haiphong6Hanoi0
- Average AQI
- Haiphong48Hanoi71
- Worst day, AQI
- Haiphong51Hanoi91
The daily numbers (6 days)
| Day | Haiphong | Hanoi |
|---|---|---|
| Nov 5 | 49 | 73 |
| Nov 6 | 50 | 80 |
| Nov 7 | 51 | 77 |
| Nov 8 | 47 | 91 |
| Nov 9 | 43 | 44 |
| Nov 10 | 45 | 61 |
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 Haiphong and Hanoi today?
Haiphong (AQI 61, Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Hanoi (AQI 154, Unhealthy): Everyone should limit long outdoor exertion; sensitive groups more so.
Exercise outdoors
- Haiphong
- Fine for most people; unusually sensitive people should take long or hard exercise easier.
- Hanoi
- Everyone should cut down long or hard exercise; sensitive groups should avoid it.
Windows
- Haiphong
- Fine to open; close them if you are sensitive to pollution.
- Hanoi
- Keep them closed.
Masks
- Haiphong
- Not needed for most people.
- Hanoi
- Wear an N95 outdoors.
Air purifier
- Haiphong
- Worth running if you are sensitive.
- Hanoi
- Run one.
Against everywhere else
How do Haiphong and Hanoi compare with the rest of the world?
Right now Haiphong's air is cleaner than 47% of the 5,420 places Airleaf tracks, and Hanoi's is cleaner than 10%. Within Vietnam, that is 25% and 0% of its 114 measured places.
Cleaner air than…
- Haiphong
- Beats 47%
- Hanoi
- Beats 10%
More tree cover than…
- Haiphong
- Beats 45%
- Hanoi
- Beats 43%
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, Haiphong or Hanoi?
Haiphong has lost more: about 132 ha of forest within 10 km of its center from 2001 to 2025, against 11 ha around Hanoi. 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: 2001, with 33 ha lost.
Worst year: 2005, with 3 ha lost.
| Haiphong | Hanoi | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 132 ha | 11 ha (better) |
| Cleared for goodTurned into farms, mines or towns. | 72 ha | 4 ha (better) |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Towns and roads (54%) | Towns and roads (34%) |
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.
Haiphong
2017: satellite photo from October 2017 of a 5 × 5 km area in the city center.
Hanoi
2017: satellite photo from December 2017 of a 5 × 5 km area in the city center.
Trees
Which has more trees, Haiphong or Hanoi?
Haiphong has more tree cover: 19.4% of the land within 2 km of its center against 18.7% around Hanoi, or about 50,281 trees against 57,632.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Haiphong | Hanoi | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 50.3K | 57.6K (better) |
| Trees still neededTo reach the target. Fewer is better. | 27.5K (better) | 65.6K |
| CO₂ absorbed each yearBy the trees already standing. | 1.1M kg | 1.3M kg (better) |
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
Haiphong vs Hanoi: your questions answered
Is Haiphong cleaner than Hanoi?
On air quality, yes, right now: Haiphong reads AQI 61 against 154, a gap of 93 points on the US EPA index. This is a live reading rather than an annual average, so it can reverse within a day. 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 Haiphong and Hanoi today?
In Haiphong, at AQI 61: Unusually sensitive people should consider limiting long outdoor exertion. In Hanoi, at AQI 154: Everyone should limit long outdoor exertion; sensitive groups more so.
Which has lost more forest, Haiphong or Hanoi?
Haiphong has lost more: about 132 ha of forest within 10 km of its center from 2001 to 2025, against 11 ha around Hanoi. 72 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Haiphong or Hanoi?
Haiphong has more tree cover: 19.4% of the land within 2 km of its center against 18.7% around Hanoi, or about 50,281 trees against 57,632. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Haiphong and Hanoi need?
Haiphong needs about 27,473 more to reach its canopy target of 30%, and Hanoi about 65,645 to reach 40%. The target starts at 30% of the land and rises where air quality is poor.
Are Haiphong and Hanoi 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 come from nearby ground stations. Nothing is adjusted for population, city limits or climate.
How often does the Haiphong vs Hanoi 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 11, 2026 and Aug 10, 2026), and the forest figures are published yearly.
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