Air quality comparison · Mexico, 2113 km apart
Santiago de Querétaro vs Tijuana Air quality index (AQI) today
Tijuana has cleaner air than Santiago de Querétaro right now: AQI 61 (Moderate) against 69 (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, both averaged AQI 58. Tijuana has lost more forest since 2001. Santiago de Querétaro has more tree cover.
Mexico
AQI 69
Moderate
Cleaner right now
- PM2.5
- 18.5 µg/m³1.2× WHO guideline
- Main pollutant
- PM2.5
- Source
- Model estimate
- Reading
- Nov 10, 18:00 local
Mexico
AQI 61
Moderate
Cleaner right now
- PM2.5
- 14.7 µg/m³
- Main pollutant
- PM2.5
- Source
- Ground station
- Reading
- Nov 11, 09:00 local
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Santiago de Querétaro69Tijuana61
Head to head
Santiago de Querétaro vs Tijuana at a glance
Santiago de Querétaro is ahead on 3 of 6 measures, and Tijuana on 2. The better figure in each row is marked.
| Santiago de Querétaro | Tijuana | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 69 | 61 (better) |
| PM2.5Fine particles, µg/m³. | 18.5 | 14.7 (better) |
| Past week's averageUS AQI, 7 days. | 58 | 58 |
| Forest lost since 2001Within 10 km of the center. | 23 ha (better) | 23 ha |
| Tree coverWithin 2 km of the center. | 8.8% (better) | 5.4% |
| Trees still neededTo reach a healthy canopy. | 66.6K (better) | 77.3K |
Air quality today
What is the air like in Santiago de Querétaro and Tijuana right now?
Tijuana has cleaner air than Santiago de Querétaro right now: AQI 61 (Moderate) against 69 (Moderate). PM2.5 is setting the index in both.
Santiago de Querétaro's PM2.5 is about 1.2× the WHO's 24-hour guideline of 15 µg/m³.
Tijuana is read from a nearby ground station and Santiago de Querétaro is a model estimate, so the two are not quite like for like.
Santiago de QuerétaroTijuana
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).
Santiago de Querétaro: Estimate · model corrected with 4 station cities within 165 km, e.g. Ciudad Nicolás Romero and Zumpango de Ocampo. Data: Open-Meteo / CAMS, corrected with 4 ground-station cities within 165 km, US EPA index.
Tijuana: Ground station · La Mesa, 2.6 km away · median of 2 stations. Data: OpenAQ · AirNow, Sinaica Mexico.
The past week
Which had cleaner air over the past 7 days?
Over the past 7 days, on modeled daily averages, both averaged AQI 58. A single reading can catch a city on a bad afternoon; the week says whether it was the weather or the place.
- Cleaner days
- Santiago de Querétaro2Tijuana5
- Average AQI
- Santiago de Querétaro58Tijuana58
- Worst day, AQI
- Santiago de Querétaro68Tijuana67
The daily numbers (7 days)
| Day | Santiago de Querétaro | Tijuana |
|---|---|---|
| Nov 4 | 41 | 39 |
| Nov 5 | 60 | 57 |
| Nov 6 | 49 | 67 |
| Nov 7 | 60 | 56 |
| Nov 8 | 58 | 61 |
| Nov 9 | 67 | 61 |
| Nov 10 | 68 | 64 |
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 Santiago de Querétaro and Tijuana 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 Santiago de Querétaro and Tijuana compare with the rest of the world?
Right now Santiago de Querétaro's air is cleaner than 38% of the 5,420 places Airleaf tracks, and Tijuana's is cleaner than 46%. Within Mexico, that is 45% and 53% of its 114 measured places.
Cleaner air than…
- Santiago de Querétaro
- Beats 38%
- Tijuana
- Beats 46%
More tree cover than…
- Santiago de Querétaro
- Beats 18%
- Tijuana
- Beats 11%
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, Santiago de Querétaro or Tijuana?
Tijuana has lost more: about 23 ha of forest within 10 km of its center from 2001 to 2025, against 23 ha around Santiago de Querétaro. 15 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: 2018, with 6 ha lost.
Worst year: 2007, with 5 ha lost.
| Santiago de Querétaro | Tijuana | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 23 ha (better) | 23 ha |
| Share of its forestOf what it had in 2000. | under 1% (better) | 16% |
| Cleared for goodTurned into farms, mines or towns. | 21 ha | 15 ha (better) |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Towns and roads (60%) | Towns and roads (48%) |
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.
Santiago de Querétaro
2017: satellite photo from March 2017 of a 5 × 5 km area in the city center.
Tijuana
2018: satellite photo from September 2018 of a 5 × 5 km area in the city center.
Trees
Which has more trees, Santiago de Querétaro or Tijuana?
Santiago de Querétaro has more tree cover: 8.8% of the land within 2 km of its center against 5.4% around Tijuana, or about 27,646 trees against 16,965.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Santiago de Querétaro | Tijuana | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 27.6K (better) | 17.0K |
| Trees still neededTo reach the target. Fewer is better. | 66.6K (better) | 77.3K |
| CO₂ absorbed each yearBy the trees already standing. | 608K kg (better) | 373K 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
Santiago de Querétaro vs Tijuana: your questions answered
Is Tijuana cleaner than Santiago de Querétaro?
On air quality, yes, right now: Tijuana reads AQI 61 against 69, a gap of 8 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, both averaged AQI 58.
Is it safe to exercise outdoors in Santiago de Querétaro and Tijuana today?
The advice is the same for both today. Unusually sensitive people should consider limiting long outdoor exertion. Santiago de Querétaro reads AQI 69 and Tijuana reads AQI 61.
Which has lost more forest, Santiago de Querétaro or Tijuana?
Tijuana has lost more: about 23 ha of forest within 10 km of its center from 2001 to 2025, against 23 ha around Santiago de Querétaro. 15 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Santiago de Querétaro or Tijuana?
Santiago de Querétaro has more tree cover: 8.8% of the land within 2 km of its center against 5.4% around Tijuana, or about 27,646 trees against 16,965. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Santiago de Querétaro and Tijuana need?
Santiago de Querétaro needs about 66,602 more to reach its canopy target of 30%, and Tijuana about 77,283 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Are Santiago de Querétaro and Tijuana 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. Tijuana is read from a nearby ground station and Santiago de Querétaro 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 Santiago de Querétaro vs Tijuana 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 10, 2026 and Sep 19, 2026), and the forest figures are published yearly.
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