In brief
Half of EU cities breach incoming air quality limits — and most of the pollution blows in from elsewhere
Nearly half of the European cities analysed — 181 of 394 — had at least one urban or suburban monitoring station above the EU's 2030 annual limit for PM2.5 in 2024, according to a working paper from the World Resources Institute and ClientEarth. The revised Ambient Air Quality Directive, in force since December 2024, halves the annual PM2.5 limit from 25 to 10 µg/m³ and cuts the NO₂ limit from 40 to 20. All but four Member States will need to reduce at least one major pollutant by 2030. Transposition into national law is due by 12 December 2026. Zones above the incoming limits must then produce air quality road maps — baseline scenario, modelled projections and the measures that will deliver compliance — between 2026 and the end of 2029, drawing on Annex VIII's indicative list of abatement measures.
On average, European cities generate only a third of their own PM2.5; in France and Italy, roughly 72–73% originates outside city boundaries. Yet only two of the local authorities interviewed had, or would soon have, scenario-based modelling to 2030 — and only Spanish interviewees reported any involvement in national transposition. The authors could not secure a single interview with a national government official.
The sources still to be tackled sit largely beyond municipal control: ammonia from agriculture (93% of EU ammonia emissions), non-exhaust emissions from tyres and brakes, and residential solid fuel burning, the largest PM2.5 source in 56% of 708 EU urban areas surveyed.
Air pollution remains Europe's largest environmental health risk: fine particulate matter alone was linked to 182,000 deaths in 2023, according to the European Environment Agency. The economics also favour action. The Commission's impact assessment put annual benefits at €42–121 billion against roughly €6 billion in costs, and Dechezleprêtre and Vienne attribute 30% of Europe's productivity gains between 2010 and 2019 to cleaner air.
