Air quality comparison · Morocco, 246 km apart
Casablanca vs Fes Air quality index (AQI) today
Casablanca has cleaner air than Fes right now: AQI 51 (Moderate) against 77 (Moderate).
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, Fes averaged AQI 46 against 52, and it was the cleaner of the two on 4 of those days. Fes has more tree cover.
Morocco
AQI 51
Moderate
Cleaner right now
- PM2.5
- 10.6 µg/m³
- Main pollutant
- PM2.5
- Source
- Model estimate
- Reading
- Nov 10, 20:00 local
Morocco
AQI 77
Moderate
Cleaner right now
- PM2.5
- 21.3 µg/m³1.4× WHO guideline
- Main pollutant
- PM2.5
- Source
- Model estimate
- Reading
- Nov 11, 05:00 local
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Casablanca51Fes77
Head to head
Casablanca vs Fes at a glance
Fes is ahead on 3 of 5 measures, and Casablanca on 2. The better figure in each row is marked.
| Casablanca | Fes | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 51 (better) | 77 |
| PM2.5Fine particles, µg/m³. | 10.6 (better) | 21.3 |
| Past week's averageUS AQI, 6 days. | 52 | 46 (better) |
| Tree coverWithin 2 km of the center. | 4.1% | 8.9% (better) |
| Trees still neededTo reach a healthy canopy. | 80.1K | 66.3K (better) |
Air quality today
What is the air like in Casablanca and Fes right now?
Casablanca has cleaner air than Fes right now: AQI 51 (Moderate) against 77 (Moderate). PM2.5 is setting the index in both.
Fes's PM2.5 is about 1.4× the WHO's 24-hour guideline of 15 µg/m³.
Both readings are model estimates, with no ground station close enough to either.
CasablancaFes
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).
Casablanca: Model estimate · no ground station nearby. Data: Open-Meteo / CAMS, US EPA index.
Fes: Estimate · model corrected with 3 station cities within 245 km, e.g. Nador and Gibraltar. Data: Open-Meteo / CAMS, corrected with 3 ground-station cities within 245 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, Fes averaged AQI 46 against 52, and it was the cleaner of the two on 4 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
- Casablanca2Fes4
- Average AQI
- Casablanca52Fes46
- Worst day, AQI
- Casablanca72Fes54
The daily numbers (6 days)
| Day | Casablanca | Fes |
|---|---|---|
| Nov 5 | 57 | 50 |
| Nov 6 | 62 | 54 |
| Nov 7 | 72 | 54 |
| Nov 8 | 46 | 42 |
| Nov 9 | 35 | 39 |
| Nov 10 | 37 | 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 Casablanca and Fes 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 Casablanca and Fes compare with the rest of the world?
Right now Casablanca's air is cleaner than 60% of the 5,420 places Airleaf tracks, and Fes's is cleaner than 32%. Within Morocco, that is 50% and 0% of its 37 measured places.
Cleaner air than…
- Casablanca
- Beats 60%
- Fes
- Beats 32%
More tree cover than…
- Casablanca
- Beats 8%
- Fes
- Beats 18%
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.
Casablanca
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
Fes
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
Trees
Which has more trees, Casablanca or Fes?
Fes has more tree cover: 8.9% of the land within 2 km of its center against 4.1% around Casablanca, or about 27,960 trees against 12,687.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Casablanca | Fes | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 12.7K | 28.0K (better) |
| Trees still neededTo reach the target. Fewer is better. | 80.1K | 66.3K (better) |
| CO₂ absorbed each yearBy the trees already standing. | 279K kg | 615K 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
Casablanca vs Fes: your questions answered
Is Casablanca cleaner than Fes?
On air quality, yes, right now: Casablanca reads AQI 51 against 77, a gap of 26 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, Fes averaged AQI 46 against 52, and it was the cleaner of the two on 4 of those days.
Is it safe to exercise outdoors in Casablanca and Fes today?
The advice is the same for both today. Unusually sensitive people should consider limiting long outdoor exertion. Casablanca reads AQI 51 and Fes reads AQI 77.
Which has more trees, Casablanca or Fes?
Fes has more tree cover: 8.9% of the land within 2 km of its center against 4.1% around Casablanca, or about 27,960 trees against 12,687. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Casablanca and Fes need?
Casablanca needs about 80,147 more to reach its canopy target of 30%, and Fes about 66,288 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Are Casablanca and Fes 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 Casablanca vs Fes 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 14, 2026 and Sep 19, 2026), and the forest figures are published yearly.
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