Air quality comparison · Algeria, 318 km apart
Algiers vs Constantine Air quality index (AQI) today
Constantine has cleaner air than Algiers right now: AQI 54 (Moderate) against 70 (Moderate).
Both sit in the same EPA band, so the health advice is the same for each today. Over the past 6 days, on modeled daily averages, Constantine averaged AQI 42 against 56, and it was the cleaner of the two on 6 of those days. Constantine has lost more forest since 2001. Constantine has more tree cover.
Algeria
AQI 70
Moderate
Cleaner right now
- PM2.5
- 21.8 µg/m³1.5× WHO guideline
- Main pollutant
- PM2.5
- Source
- Model estimate
- Reading
- Nov 10, 21:00 local
Algeria
AQI 54
Moderate
Cleaner right now
- PM2.5
- 11.7 µg/m³
- Main pollutant
- PM2.5
- Source
- Model estimate
- Reading
- Nov 11, 06:00 local
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Algiers70Constantine54
Head to head
Algiers vs Constantine at a glance
Constantine is ahead on 5 of 6 measures, and Algiers on 1. The better figure in each row is marked.
| Algiers | Constantine | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 70 | 54 (better) |
| PM2.5Fine particles, µg/m³. | 21.8 | 11.7 (better) |
| Past week's averageUS AQI, 6 days. | 56 | 42 (better) |
| Forest lost since 2001Within 10 km of the center. | 70 ha (better) | 170 ha |
| Tree coverWithin 2 km of the center. | 14.8% | 21.9% (better) |
| Trees still neededTo reach a healthy canopy. | 47.2K | 25.4K (better) |
Air quality today
What is the air like in Algiers and Constantine right now?
Constantine has cleaner air than Algiers right now: AQI 54 (Moderate) against 70 (Moderate). PM2.5 is setting the index in both.
Algiers's PM2.5 is about 1.5× the WHO's 24-hour guideline of 15 µg/m³.
Both readings are model estimates, with no ground station close enough to either.
AlgiersConstantine
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).
Algiers: Model estimate · no ground station nearby. Data: Open-Meteo / CAMS, US EPA index.
Constantine: Model estimate · no ground station nearby. Data: Open-Meteo / CAMS, US EPA index.
The past week
Which had cleaner air over the past 6 days?
Over the past 6 days, on modeled daily averages, Constantine averaged AQI 42 against 56, 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
- Algiers0Constantine6
- Average AQI
- Algiers56Constantine42
- Worst day, AQI
- Algiers64Constantine49
The daily numbers (6 days)
| Day | Algiers | Constantine |
|---|---|---|
| Nov 5 | 47 | 40 |
| Nov 6 | 52 | 42 |
| Nov 7 | 55 | 40 |
| Nov 8 | 58 | 43 |
| Nov 9 | 57 | 40 |
| Nov 10 | 64 | 49 |
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 Algiers and Constantine 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 Algiers and Constantine compare with the rest of the world?
Right now Algiers's air is cleaner than 38% of the 5,420 places Airleaf tracks, and Constantine's is cleaner than 56%. Within Algeria, that is 0% and 23% of its 40 measured places.
Cleaner air than…
- Algiers
- Beats 38%
- Constantine
- Beats 56%
More tree cover than…
- Algiers
- Beats 34%
- Constantine
- Beats 51%
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, Algiers or Constantine?
Constantine has lost more: about 170 ha of forest within 10 km of its center from 2001 to 2025, against 70 ha around Algiers. 22 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: 2019, with 7 ha lost.
Worst year: 2009, with 38 ha lost.
| Algiers | Constantine | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 70 ha (better) | 170 ha |
| Share of its forestOf what it had in 2000. | 12% (better) | 22% |
| Cleared for goodTurned into farms, mines or towns. | 66 ha | 22 ha (better) |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Towns and roads (82%) | Wildfires (73%) |
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.
Algiers
2017: satellite photo from September 2017 of a 5 × 5 km area in the city center.
Constantine
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
Trees
Which has more trees, Algiers or Constantine?
Constantine has more tree cover: 21.9% of the land within 2 km of its center against 14.8% around Algiers, or about 68,801 trees against 45,984.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Algiers | Constantine | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 46.0K | 68.8K (better) |
| Trees still neededTo reach the target. Fewer is better. | 47.2K | 25.4K (better) |
| CO₂ absorbed each yearBy the trees already standing. | 1.0M kg | 1.5M 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
Algiers vs Constantine: your questions answered
Is Constantine cleaner than Algiers?
On air quality, yes, right now: Constantine reads AQI 54 against 70, a gap of 16 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 6 days, on modeled daily averages, Constantine averaged AQI 42 against 56, and it was the cleaner of the two on 6 of those days.
Is it safe to exercise outdoors in Algiers and Constantine today?
The advice is the same for both today. Unusually sensitive people should consider limiting long outdoor exertion. Algiers reads AQI 70 and Constantine reads AQI 54.
Which has lost more forest, Algiers or Constantine?
Constantine has lost more: about 170 ha of forest within 10 km of its center from 2001 to 2025, against 70 ha around Algiers. 22 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Algiers or Constantine?
Constantine has more tree cover: 21.9% of the land within 2 km of its center against 14.8% around Algiers, or about 68,801 trees against 45,984. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Algiers and Constantine need?
Algiers needs about 47,227 more to reach its canopy target of 30%, and Constantine about 25,447 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Are Algiers and Constantine 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 Algiers vs Constantine 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 15, 2026 and Sep 9, 2026), and the forest figures are published yearly.
Keep going
Compare them with somewhere else
Build your own
Compare Algiers with somewhere else
This place
Algiers