Air quality comparison · Senegal, 113 km apart
Thiès vs Touba Air quality index (AQI) today
Thiès has cleaner air than Touba right now: AQI 47 (Good) against 48 (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, Touba averaged AQI 54 against 61, and it was the cleaner of the two on 6 of those days. Thiès has more tree cover.
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Thiès47Touba48
Head to head
Thiès vs Touba at a glance
Thiès is ahead on 3 of 5 measures, and Touba on 2. The better figure in each row is marked.
| Thiès | Touba | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 47 (better) | 48 |
| PM2.5Fine particles, µg/m³. | 8.5 | 7.8 (better) |
| Past week's averageUS AQI, 6 days. | 61 | 54 (better) |
| Tree coverWithin 2 km of the center. | 17.1% (better) | 2.5% |
| Trees still neededTo reach a healthy canopy. | 40.5K (better) | 86.4K |
Air quality today
What is the air like in Thiès and Touba right now?
Thiès has cleaner air than Touba right now: AQI 47 (Good) against 48 (Good). PM2.5 is setting the index in both.
Thiès is read from a nearby ground station and Touba is a model estimate, so the two are not quite like for like.
ThièsTouba
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).
Thiès: Ground station · Lycée Jules Sagna de Thiès, 800 m away. Data: OpenAQ · AirGradient, kaikai.dev.
Touba: Estimate · model corrected with 2 station cities within 125 km, e.g. Tivaouane and Thiès. Data: Open-Meteo / CAMS, corrected with 2 ground-station cities within 125 km, US EPA index.
The past week
Which had cleaner air over the past 6 days?
But over the past 6 days, on modeled daily averages, Touba averaged AQI 54 against 61, 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
- Thiès0Touba6
- Average AQI
- Thiès61Touba54
- Worst day, AQI
- Thiès68Touba58
The daily numbers (6 days)
| Day | Thiès | Touba |
|---|---|---|
| Nov 5 | 57 | 56 |
| Nov 6 | 60 | 58 |
| Nov 7 | 65 | 58 |
| Nov 8 | 68 | 53 |
| Nov 9 | 62 | 50 |
| Nov 10 | 56 | 51 |
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 Thiès and Touba 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 Thiès and Touba compare with the rest of the world?
Right now Thiès's air is cleaner than 64% of the 5,420 places Airleaf tracks, and Touba's is cleaner than 64%. Within Senegal, that is 57% and 50% of its 15 measured places.
Cleaner air than…
- Thiès
- Beats 64%
- Touba
- Beats 64%
More tree cover than…
- Thiès
- Beats 39%
- Touba
- Beats 5%
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.
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.
Thiès
2017: satellite photo from February 2017 of a 5 × 5 km area in the city center.
Touba
2017: satellite photo from March 2017 of a 5 × 5 km area in the city center.
Trees
Which has more trees, Thiès or Touba?
Thiès has more tree cover: 17.1% of the land within 2 km of its center against 2.5% around Touba, or about 53,721 trees against 7,854.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Thiès | Touba | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 53.7K (better) | 7.9K |
| Trees still neededTo reach the target. Fewer is better. | 40.5K (better) | 86.4K |
| CO₂ absorbed each yearBy the trees already standing. | 1.2M kg (better) | 173K 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
Thiès vs Touba: your questions answered
Is Thiès cleaner than Touba?
On air quality, yes, right now: Thiès reads AQI 47 against 48, a gap of 1 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, Touba averaged AQI 54 against 61, and it was the cleaner of the two on 6 of those days.
Is it safe to exercise outdoors in Thiès and Touba today?
The advice is the same for both today. Air quality is satisfactory for everyone. Thiès reads AQI 47 and Touba reads AQI 48.
Which has more trees, Thiès or Touba?
Thiès has more tree cover: 17.1% of the land within 2 km of its center against 2.5% around Touba, or about 53,721 trees against 7,854. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Thiès and Touba need?
Thiès needs about 40,527 more to reach its canopy target of 30%, and Touba about 86,394 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Are Thiès and Touba 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. Thiès is read from a nearby ground station and Touba 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 Thiès vs Touba 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 18, 2026 and Sep 10, 2026), and the forest figures are published yearly.
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