# Air pollution in Lombardy, Italy > Live situation record from CLSTR: https://clstr.news/situations/air-pollution-in-lombardy-italy > Updated: 2026-10-09T07:32:10.000Z. Sources: 5. Developments: 2. Air quality issues in Lombardy, Italy, have drawn significant economic and environmental scrutiny. A study under the Horizon Europe VALESOR project estimated that PM2.5 pollution exposure costs the region approximately 33.4 billion euros annually, representing 7.3 percent of the regional GDP. These costs stem from healthcare expenditures, lost productivity, and diminished quality of life. In response, the association ‘Cittadini per l’Aria’ filed a complaint with the regional Prosecutor of the Court of Auditors to investigate potential liabilities regarding air quality policies. Environmental reports further highlighted severe pollution levels during the summer of 2026. Legambiente Lombardia reported that high temperatures and dry weather led to critical ozone pollution, with many provincial capitals exceeding European regulatory limits. Bergamo and Monza recorded over 110 days of unhealthy air, while Varese saw a significant increase in days exceeding regulatory limits compared to the previous year. ## Timeline ### 2026-10-09: Lombardy reports record ozone pollution levels in summer 2026 Legambiente reports record ozone pollution in Lombardy during summer 2026, with cities like Bergamo, Monza, and Varese significantly exceeding European air quality limits. 2 sources. https://clstr.news/cluster/lombardy-reports-record-ozone-pollution-levels-in-summer-2026 ### 2026-09-23: Lombardia air pollution costs reach 33.4 billion euros annually PM2.5 pollution costs Lombardy 33.4 billion euros annually, or 7.3% of its GDP. Meanwhile, seasonal anti-smog measures and PM10 monitoring protocols resume in the region this October. 3 sources. https://clstr.news/cluster/lombardia-air-pollution-costs-reach-334-billion-euros-annually --- Cite as: Air pollution in Lombardy, Italy. CLSTR, https://clstr.news/situations/air-pollution-in-lombardy-italy