Paris Air Quality
Île-de-France, France · 12.2M metro population
Moderate
2024 avg
55
Annual AQI
2024 average
11.2 μg/m³
PM2.5
2.2× WHO limit
35 μg/m³
NO2
Annual avg
5 μg/m³
WHO Limit
PM2.5 guideline
Monthly AQI Pattern
Monthly average AQI — worst in winter (Dec–Feb) and during high-pressure blocking episodes
Paris Air Pollution Sources
Agriculture: The Unexpected Source
One of Paris's most distinctive pollution problems is agricultural ammonia (NH₃) from surrounding Île-de-France farmland. Ammonia from fertilizers and livestock reacts with vehicle NOx and SO₂ to form ammonium nitrate and ammonium sulfate particles — contributing up to 30% of Paris PM2.5. Spring plowing and fertilizer application season (March–April) can trigger PM2.5 episodes.
Winter High-Pressure Episodes
Paris regularly experiences winter pollution episodes when Anticyclonic blocking — a stationary high-pressure system — prevents winds from dispersing pollution. During these events (typically 3–7 days), PM2.5 accumulates daily and can push AQI above 100–150. AIRPARIF (Paris air quality agency) issues advisories and the city activates alternating driving restrictions (Circulation Différenciée) when PM10 exceeds EU limits.
Traffic: Diesel Remains a Problem
Despite massive cycling infrastructure investment and free public transport during pollution alerts, Paris still has significant diesel vehicle traffic. Paris banned diesel vehicles older than 2001 from the city center, and pre-2011 diesels are restricted on high-pollution days. The Crit'Air vignette system classifies vehicles by emission level for access restrictions.
Wood Burning: Growing Problem
As in London, residential wood burning has grown in popularity in the Paris region as energy costs rose. French authorities estimate wood burning now accounts for ~30% of PM2.5 in Île-de-France in winter. New regulations introduced in 2022 require the gradual replacement of non-certified stoves, and open fireplaces are banned on pollution alert days.
Frequently Asked Questions
Is Paris air quality getting better?
Yes — long-term. Paris PM2.5 has fallen significantly over the past 20 years, driven by stricter vehicle emission standards, banning old diesel vehicles, and switching heating from oil to gas. However, progress has slowed recently because wood burning (a growing source) and agricultural ammonia (a persistent structural problem) are harder to regulate than vehicle emissions.
What happens during Paris pollution episodes?
When AQI exceeds 100 on consecutive days, AIRPARIF issues pollution alerts. The city activates free public transport (including Vélib' bikes), limits vehicle access by alternating number plate restrictions (Circulation Différenciée), and bans open fireplace use. Schools reduce outdoor physical activity. Major events can also trigger speed limits on the Périphérique.
When is Paris air quality worst?
December through February brings the worst air quality — cold anticyclonic blocking traps PM2.5 from wood burning and traffic. March is also risky due to agricultural ammonia from spring fertilizer application. Summer brings mild ozone on hot, sunny days. The best months are May, June, and September when Atlantic winds clear the air regularly.
How does Paris compare to London for air quality?
Paris (AQI ~55, PM2.5 ~11.2 μg/m³) is slightly worse than London (AQI ~52, PM2.5 ~9.8 μg/m³) on annual averages. Both cities exceed WHO PM2.5 guidelines of 5 μg/m³. London has the ULEZ vehicle charge scheme; Paris has the Crit'Air vignette system. Both cities have growing wood-burning PM2.5 problems.