Air quality comparison · Trinidad and Tobago, 44 km apart
Mon Repos vs Port of Spain Air quality index (AQI) today
Port of Spain has cleaner air than Mon Repos right now: AQI 24 (Good) against 31 (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, Mon Repos averaged AQI 38 against 40, and it was the cleaner of the two on 5 of those days. Port of Spain has lost more forest since 2001. Port of Spain has more tree cover.
Trinidad and Tobago
AQI 31
Good
Cleaner right now
- PM2.5
- 5.5 µg/m³
- Main pollutant
- PM2.5
- Source
- Ground station
- Reading
- Nov 11, 12:00 local
Trinidad and Tobago
AQI 24
Good
Cleaner right now
- PM2.5
- 4.3 µg/m³
- Main pollutant
- PM2.5
- Source
- Ground station
- Reading
- Nov 11, 12:00 local
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Mon Repos31Port of Spain24
Head to head
Mon Repos vs Port of Spain at a glance
Port of Spain is ahead on 4 of 6 measures, and Mon Repos on 2. The better figure in each row is marked.
| Mon Repos | Port of Spain | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 31 | 24 (better) |
| PM2.5Fine particles, µg/m³. | 5.5 | 4.3 (better) |
| Past week's averageUS AQI, 6 days. | 38 (better) | 40 |
| Forest lost since 2001Within 10 km of the center. | 313 ha (better) | 562 ha |
| Tree coverWithin 2 km of the center. | 15.9% | 22.3% (better) |
| Trees still neededTo reach a healthy canopy. | 44.3K | 22.6K (better) |
Air quality today
What is the air like in Mon Repos and Port of Spain right now?
Port of Spain has cleaner air than Mon Repos right now: AQI 24 (Good) against 31 (Good). PM2.5 is setting the index in both.
Both readings come from nearby ground stations.
Mon ReposPort of Spain
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).
Mon Repos: Ground station · Point Lisas, Trinidad and Tobago, 15.5 km away. Data: World Air Quality Index Project, Trinidad & Tobago - Environmental Management Authority.
Port of Spain: Ground station · Port of Spain, Trinidad and Tobago, 3.8 km away. Data: World Air Quality Index Project, Trinidad & Tobago - Environmental Management Authority.
The past week
Which had cleaner air over the past 6 days?
But over the past 6 days, on modeled daily averages, Mon Repos averaged AQI 38 against 40, and it was the cleaner of the two on 5 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
- Mon Repos5Port of Spain0
- Average AQI
- Mon Repos38Port of Spain40
- Worst day, AQI
- Mon Repos50Port of Spain50
The daily numbers (6 days)
| Day | Mon Repos | Port of Spain |
|---|---|---|
| Nov 5 | 44 | 49 |
| Nov 6 | 50 | 50 |
| Nov 7 | 45 | 47 |
| Nov 8 | 40 | 42 |
| Nov 9 | 31 | 34 |
| Nov 10 | 17 | 18 |
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 Mon Repos and Port of Spain 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 Mon Repos and Port of Spain compare with the rest of the world?
Right now Mon Repos's air is cleaner than 79% of the 5,420 places Airleaf tracks, and Port of Spain's is cleaner than 85%. Within Trinidad and Tobago, that is 0% and 25% of its 5 measured places.
Cleaner air than…
- Mon Repos
- Beats 79%
- Port of Spain
- Beats 85%
More tree cover than…
- Mon Repos
- Beats 37%
- Port of Spain
- Beats 52%
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, Mon Repos or Port of Spain?
Port of Spain has lost more: about 562 ha of forest within 10 km of its center from 2001 to 2025, against 313 ha around Mon Repos. 383 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 76 ha lost.
Worst year: 2001, with 113 ha lost.
| Mon Repos | Port of Spain | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 313 ha (better) | 562 ha |
| Share of its forestOf what it had in 2000. | 11% | 4.6% (better) |
| Cleared for goodTurned into farms, mines or towns. | 295 ha (better) | 383 ha |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Farms, pasture and plantations (66%) | Towns and roads (42%) |
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.
Mon Repos
2021: satellite photo from January 2021 of a 5 × 5 km area in the city center.
Port of Spain
2017: satellite photo from January 2017 of a 5 × 5 km area about 7 km southeast of the city center.
Trees
Which has more trees, Mon Repos or Port of Spain?
Port of Spain has more tree cover: 22.3% of the land within 2 km of its center against 15.9% around Mon Repos, or about 65,364 trees against 49,951.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Mon Repos | Port of Spain | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 50.0K | 65.4K (better) |
| Trees still neededTo reach the target. Fewer is better. | 44.3K | 22.6K (better) |
| CO₂ absorbed each yearBy the trees already standing. | 1.1M kg | 1.4M 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
Mon Repos vs Port of Spain: your questions answered
Is Port of Spain cleaner than Mon Repos?
On air quality, yes, right now: Port of Spain reads AQI 24 against 31, a gap of 7 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, Mon Repos averaged AQI 38 against 40, and it was the cleaner of the two on 5 of those days.
Is it safe to exercise outdoors in Mon Repos and Port of Spain today?
The advice is the same for both today. Air quality is satisfactory for everyone. Mon Repos reads AQI 31 and Port of Spain reads AQI 24.
Which has lost more forest, Mon Repos or Port of Spain?
Port of Spain has lost more: about 562 ha of forest within 10 km of its center from 2001 to 2025, against 313 ha around Mon Repos. 383 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Mon Repos or Port of Spain?
Port of Spain has more tree cover: 22.3% of the land within 2 km of its center against 15.9% around Mon Repos, or about 65,364 trees against 49,951. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Mon Repos and Port of Spain need?
Mon Repos needs about 44,296 more to reach its canopy target of 30%, and Port of Spain about 22,570 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Why can two places 44 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 Mon Repos and Port of Spain 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 Mon Repos vs Port of Spain 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 (Aug 5, 2026 and Aug 22, 2026), and the forest figures are published yearly.
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