Marking the International Day of Clean Air for Blue Skies on Thursday, UN Secretary-General António Guterres issued a powerful call for increased international cooperation to address the "global emergency" of worsening air pollution.

Airborne contaminants are one of the most significant environmental health risks. According to the UN World Health Organization (WHO), 99 per cent of the world's population breathes polluted air, with the exposure significantly worse in low and middle-income countries.

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