Wildfire Smoke and Heat Are Destroying Decades of Clean Air Progress, UN Warns

Wildfire Smoke and Heat Are Destroying Decades of Clean Air Progress, UN Warns

Wildfires and heatwaves fueled by climate change are reversing years of progress in cleaning up the world’s air, according to a new report from the World Meteorological Organization (WMO) [237506][236860].

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Extreme fire-smoke events have tripled globally since the 1990s, and rising temperatures are making ground-level ozone—a harmful pollutant that forms when heat reacts with vehicle and industrial emissions—more severe [236904]. The UN agency warned that these twin threats are exposing more people to toxic fine particle pollution, known as PM2.5, which can enter the lungs and bloodstream and cause serious health problems [236860].

The danger is rising even in Europe and North America, where stricter regulations have already cut pollution from factories and vehicles [236860]. Smoke from mega-fires travels thousands of kilometers, crossing borders and undoing local gains [236904]. Even regions with strict pollution limits are seeing worse air during summer spikes as hotter weather speeds up the formation of ground-level ozone [236904].

The WMO stressed that cutting fossil fuel emissions remains the core fix [236904]. But it added that even with current climate pledges, more frequent heatwaves will keep pushing ozone levels up unless nations also target the specific pollutants that feed it [236904]. The agency called for better cross-border monitoring and faster adaptation to a hotter, smokier future [236904].

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Wildfire Smoke Reverses Clean Air Gains, UN Warns #237506Wildfires and heatwaves are undermining global progress on air quality, UN warns #236860Wildfire smoke and scorching heat are reversing decades of progress in cleaning the world’s air, according to the World Meteorological Organization (WMO). #236904

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