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'Climate breakdown' alert as air quality dips during heatwaves: UN chief

Amplified by wildfires and desert dust fanned by climate change, more frequent heatwaves are leading to a sharp drop in air quality and human health, the World Meteorological Organization (WMO) said in a new report on Wednesday.

The news came as the UN chief released a strongly worded statement on a record summer of global warming in the northern hemisphere, according to the European Union's climate service Copernicus and WMO.