Air quality comparison · Haiti, 93 km apart
Port-de-Paix vs Saint-Marc Air quality index (AQI) today
Port-de-Paix has cleaner air than Saint-Marc right now: AQI 51 (Moderate) against 71 (Moderate).
Both sit in the same EPA band, so the health advice is the same for each today. Over the past 7 days, on modeled daily averages, Port-de-Paix averaged AQI 50 against 64, and it was the cleaner of the two on 7 of those days. Saint-Marc has lost more forest since 2001. Port-de-Paix has more tree cover.
Haiti
AQI 51
Moderate
Cleaner right now
- PM2.5
- 9.4 µg/m³
- Main pollutant
- PM2.5
- Source
- Model estimate
- Reading
- Nov 10, 16:00 local
Haiti
AQI 71
Moderate
Cleaner right now
- PM2.5
- 17.2 µg/m³1.1× WHO guideline
- Main pollutant
- PM2.5
- Source
- Model estimate
- Reading
- Nov 10, 08:00 local
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Port-de-Paix51Saint-Marc71
Head to head
Port-de-Paix vs Saint-Marc at a glance
Port-de-Paix is ahead on 6 of 6 measures, and Saint-Marc on 0. The better figure in each row is marked.
| Port-de-Paix | Saint-Marc | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 51 (better) | 71 |
| PM2.5Fine particles, µg/m³. | 9.4 (better) | 17.2 |
| Past week's averageUS AQI, 7 days. | 50 (better) | 64 |
| Forest lost since 2001Within 10 km of the center. | 342 ha (better) | 611 ha |
| Tree coverWithin 2 km of the center. | 37.9% (better) | 11.4% |
| Trees still neededTo reach a healthy canopy. | 0 (better) | 32.4K |
Air quality today
What is the air like in Port-de-Paix and Saint-Marc right now?
Port-de-Paix has cleaner air than Saint-Marc right now: AQI 51 (Moderate) against 71 (Moderate). PM2.5 is setting the index in both.
Saint-Marc's PM2.5 is about 1.1× the WHO's 24-hour guideline of 15 µg/m³.
Both readings are model estimates, with no ground station close enough to either.
Port-de-PaixSaint-Marc
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).
Port-de-Paix: Model estimate · no ground station nearby. Data: Open-Meteo / CAMS, US EPA index.
Saint-Marc: Model estimate · no ground station nearby. Data: Open-Meteo / CAMS, US EPA index.
The past week
Which had cleaner air over the past 7 days?
Over the past 7 days, on modeled daily averages, Port-de-Paix averaged AQI 50 against 64, and it was the cleaner of the two on 7 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
- Port-de-Paix7Saint-Marc0
- Average AQI
- Port-de-Paix50Saint-Marc64
- Worst day, AQI
- Port-de-Paix60Saint-Marc77
The daily numbers (7 days)
| Day | Port-de-Paix | Saint-Marc |
|---|---|---|
| Nov 4 | 60 | 77 |
| Nov 5 | 48 | 69 |
| Nov 6 | 37 | 62 |
| Nov 7 | 52 | 63 |
| Nov 8 | 50 | 54 |
| Nov 9 | 50 | 57 |
| Nov 10 | 53 | 69 |
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 Port-de-Paix and Saint-Marc 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 Port-de-Paix and Saint-Marc compare with the rest of the world?
Right now Port-de-Paix's air is cleaner than 61% of the 5,420 places Airleaf tracks, and Saint-Marc's is cleaner than 37%. Within Haiti, that is 90% and 50% of its 11 measured places.
Cleaner air than…
- Port-de-Paix
- Beats 61%
- Saint-Marc
- Beats 37%
More tree cover than…
- Port-de-Paix
- Beats 81%
- Saint-Marc
- Beats 25%
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, Port-de-Paix or Saint-Marc?
Saint-Marc has lost more: about 611 ha of forest within 10 km of its center from 2001 to 2025, against 342 ha around Port-de-Paix. 573 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: 2011, with 47 ha lost.
Worst year: 2002, with 110 ha lost.
| Port-de-Paix | Saint-Marc | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 342 ha (better) | 611 ha |
| Share of its forestOf what it had in 2000. | 5.1% (better) | 11% |
| Cleared for goodTurned into farms, mines or towns. | 336 ha (better) | 573 ha |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Farms, pasture and plantations (93%) | Farms, pasture and plantations (75%) |
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.
Port-de-Paix
2017: satellite photo from January 2017 of a 5 × 5 km area about 7 km south of the city center.
Saint-Marc
2017: satellite photo from January 2017 of a 5 × 5 km area about 7 km southwest of the city center.
Trees
Which has more trees, Port-de-Paix or Saint-Marc?
Port-de-Paix has more tree cover: 37.9% of the land within 2 km of its center against 11.4% around Saint-Marc, or about 81,084 trees against 19,877.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Port-de-Paix | Saint-Marc | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 81.1K (better) | 19.9K |
| Trees still neededTo reach the target. Fewer is better. | 0 (better) | 32.4K |
| CO₂ absorbed each yearBy the trees already standing. | 1.8M kg (better) | 437K 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
Port-de-Paix vs Saint-Marc: your questions answered
Is Port-de-Paix cleaner than Saint-Marc?
On air quality, yes, right now: Port-de-Paix reads AQI 51 against 71, a gap of 20 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 7 days, on modeled daily averages, Port-de-Paix averaged AQI 50 against 64, and it was the cleaner of the two on 7 of those days.
Is it safe to exercise outdoors in Port-de-Paix and Saint-Marc today?
The advice is the same for both today. Unusually sensitive people should consider limiting long outdoor exertion. Port-de-Paix reads AQI 51 and Saint-Marc reads AQI 71.
Which has lost more forest, Port-de-Paix or Saint-Marc?
Saint-Marc has lost more: about 611 ha of forest within 10 km of its center from 2001 to 2025, against 342 ha around Port-de-Paix. 573 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Port-de-Paix or Saint-Marc?
Port-de-Paix has more tree cover: 37.9% of the land within 2 km of its center against 11.4% around Saint-Marc, or about 81,084 trees against 19,877. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Port-de-Paix and Saint-Marc need?
Port-de-Paix needs about 0 more to reach its canopy target of 30%, and Saint-Marc about 32,431 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Are Port-de-Paix and Saint-Marc 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 Port-de-Paix vs Saint-Marc 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 17, 2026 and Sep 19, 2026), and the forest figures are published yearly.
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