10cities, 92 days of hourly data
15days of Saharan dust over at least 3 cities
2days when every city broke the WHO PM10 limit
26%of days above the PM10 limit in Tozeur, the worst city
Daily PM10 across Tunisia
Shaded bands are Saharan dust episodes. Dust lifts particle levels in every city at once, far more than any local source.
Every city, every day
Daily mean PM10, cities sorted from cleanest (top) to most polluted (bottom).
Which cities break the limit most often
Share of days above the WHO 2021 daily PM10 guideline (45 µg/m³). Tozeur, on the edge of the Sahara, peaked at 125 µg/m³ on 27 July.
The traffic signal: NO₂ drops at weekends
Nitrogen dioxide comes mostly from traffic, so it's higher on weekdays in every city. Tunis has by far the most: 7.5 µg/m³ on weekdays vs 5.7 at weekends.
Where the cities are
Bubble size and colour show mean PM10 over the period.
Pipeline health
Last run: 04 Oct 2026, 11:12 UTC. Every check below must pass before the dashboard is published.
- ✓ every city has air quality data
- ✓ every city has weather data
- ✓ one row per city and hour
- ✓ pollutant values are physically plausible (0 to 2000 ug/m3)
- ✓ PM2.5 never exceeds PM10 by more than rounding
- ✓ each city has at least 90% of hourly PM2.5 values
- ✓ data is fresh (latest day within 3 days)
- ✓ complete days have 24 hours