Air quality comparison · Mexico, 136 km apart
León de los Aldama vs San Luis Potosí Air quality index (AQI) today
San Luis Potosí has cleaner air than León de los Aldama right now: AQI 46 (Good) against 80 (Moderate).
That puts them in different EPA bands, so the health advice differs today. Over the past 7 days, on modeled daily averages, San Luis Potosí averaged AQI 38 against 48, and it was the cleaner of the two on 5 of those days. León de los Aldama has lost more forest since 2001. León de los Aldama has more tree cover.
Mexico
AQI 80
Moderate
Cleaner right now
- PM2.5
- 25.9 µg/m³1.7× WHO guideline
- Main pollutant
- PM2.5
- Source
- Model estimate
- Reading
- Nov 10, 18:00 local
Mexico
AQI 46
Good
Cleaner right now
- PM2.5
- 7.3 µg/m³
- Main pollutant
- PM2.5
- Source
- Model estimate
- Reading
- Nov 10, 07:00 local
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
León de los Aldama80San Luis Potosí46
Head to head
León de los Aldama vs San Luis Potosí at a glance
San Luis Potosí is ahead on 4 of 6 measures, and León de los Aldama on 2. The better figure in each row is marked.
| León de los Aldama | San Luis Potosí | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 80 | 46 (better) |
| PM2.5Fine particles, µg/m³. | 25.9 | 7.3 (better) |
| Past week's averageUS AQI, 7 days. | 48 | 38 (better) |
| Forest lost since 2001Within 10 km of the center. | 13 ha | 3 ha (better) |
| Tree coverWithin 2 km of the center. | 4.4% (better) | 4.2% |
| Trees still neededTo reach a healthy canopy. | 80.4K (better) | 81.1K |
Air quality today
What is the air like in León de los Aldama and San Luis Potosí right now?
San Luis Potosí has cleaner air than León de los Aldama right now: AQI 46 (Good) against 80 (Moderate). PM2.5 is setting the index in both.
León de los Aldama's PM2.5 is about 1.7× the WHO's 24-hour guideline of 15 µg/m³.
Both readings are model estimates, with no ground station close enough to either.
León de los AldamaSan Luis Potosí
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).
León de los Aldama: Estimate · model corrected with 4 station cities within 185 km, e.g. Aguascalientes and Santiago de Querétaro. Data: Open-Meteo / CAMS, corrected with 4 ground-station cities within 185 km, US EPA index.
San Luis Potosí: Estimate · model corrected with 2 station cities within 185 km, e.g. Aguascalientes and Santiago de Querétaro. Data: Open-Meteo / CAMS, corrected with 2 ground-station cities within 185 km, US EPA index.
The past week
Which had cleaner air over the past 7 days?
Over the past 7 days, on modeled daily averages, San Luis Potosí averaged AQI 38 against 48, 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
- León de los Aldama2San Luis Potosí5
- Average AQI
- León de los Aldama48San Luis Potosí38
- Worst day, AQI
- León de los Aldama63San Luis Potosí47
The daily numbers (7 days)
| Day | León de los Aldama | San Luis Potosí |
|---|---|---|
| Nov 4 | 39 | 37 |
| Nov 5 | 33 | 37 |
| Nov 6 | 30 | 47 |
| Nov 7 | 53 | 29 |
| Nov 8 | 63 | 40 |
| Nov 9 | 57 | 34 |
| Nov 10 | 61 | 39 |
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 León de los Aldama and San Luis Potosí today?
León de los Aldama (AQI 80, Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
San Luis Potosí (AQI 46, Good): Air quality is satisfactory for everyone.
Exercise outdoors
- León de los Aldama
- Fine for most people; unusually sensitive people should take long or hard exercise easier.
- San Luis Potosí
- A good day to be active outside.
Windows
- León de los Aldama
- Fine to open; close them if you are sensitive to pollution.
- San Luis Potosí
- Open them to air the house.
Masks
- León de los Aldama
- Not needed for most people.
- San Luis Potosí
- Not needed.
Air purifier
- León de los Aldama
- Worth running if you are sensitive.
- San Luis Potosí
- Not needed.
Against everywhere else
How do León de los Aldama and San Luis Potosí compare with the rest of the world?
Right now León de los Aldama's air is cleaner than 30% of the 5,420 places Airleaf tracks, and San Luis Potosí's is cleaner than 65%. Within Mexico, that is 35% and 73% of its 114 measured places.
Cleaner air than…
- León de los Aldama
- Beats 30%
- San Luis Potosí
- Beats 65%
More tree cover than…
- León de los Aldama
- Beats 9%
- San Luis Potosí
- Beats 8%
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, León de los Aldama or San Luis Potosí?
León de los Aldama has lost more: about 13 ha of forest within 10 km of its center from 2001 to 2025, against 3 ha around San Luis Potosí. 11 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 6 ha lost.
Worst year: 2023, with under 1 ha lost.
| León de los Aldama | San Luis Potosí | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 13 ha | 3 ha (better) |
| Cleared for goodTurned into farms, mines or towns. | 11 ha | 2 ha (better) |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Towns and roads (44%) | Farms, pasture and plantations (63%) |
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.
León de los Aldama
2017: satellite photo from January 2017 of a 5 × 5 km area in the city center.
San Luis Potosí
2017: satellite photo from April 2017 of a 5 × 5 km area in the city center.
Trees
Which has more trees, León de los Aldama or San Luis Potosí?
León de los Aldama has more tree cover: 4.4% of the land within 2 km of its center against 4.2% around San Luis Potosí, or about 13,823 trees against 13,195.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| León de los Aldama | San Luis Potosí | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 13.8K (better) | 13.2K |
| Trees still neededTo reach the target. Fewer is better. | 80.4K (better) | 81.1K |
| CO₂ absorbed each yearBy the trees already standing. | 304K kg (better) | 290K 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
León de los Aldama vs San Luis Potosí: your questions answered
Is San Luis Potosí cleaner than León de los Aldama?
On air quality, yes, right now: San Luis Potosí reads AQI 46 against 80, a gap of 34 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, San Luis Potosí averaged AQI 38 against 48, and it was the cleaner of the two on 5 of those days.
Is it safe to exercise outdoors in León de los Aldama and San Luis Potosí today?
In León de los Aldama, at AQI 80: Unusually sensitive people should consider limiting long outdoor exertion. In San Luis Potosí, at AQI 46: Air quality is satisfactory for everyone.
Which has lost more forest, León de los Aldama or San Luis Potosí?
León de los Aldama has lost more: about 13 ha of forest within 10 km of its center from 2001 to 2025, against 3 ha around San Luis Potosí. 11 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, León de los Aldama or San Luis Potosí?
León de los Aldama has more tree cover: 4.4% of the land within 2 km of its center against 4.2% around San Luis Potosí, or about 13,823 trees against 13,195. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do León de los Aldama and San Luis Potosí need?
León de los Aldama needs about 80,425 more to reach its canopy target of 30%, and San Luis Potosí about 81,053 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Are León de los Aldama and San Luis Potosí 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 León de los Aldama vs San Luis Potosí 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 5, 2026 and Sep 20, 2026), and the forest figures are published yearly.
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