Wildfires are releasing a "witches' brew" of pollutants that can end up wrecking air quality a continent away from the blaze, the UN's weather and climate agency said Friday.

The World Meteorological Organization said the quality of the air people breathe was interlinked with climate change, and the two issues needed to be tackled together.

Wildfires in the Amazon, Canada and Siberia have brought home how air quality can be impacted on a vast scale, the WMO said in its fifth annual Air Quality and Climate Bulletin.

"Climate impacts and air pollution respect no national borders -- as exemplified by intense heat and drought which fuels wildfires, worsening air quality for millions of people," said WMO deputy secretary-general Ko Barrett.

The bulletin looked at the interplay between air q

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