UN chief calls air pollution "global emergency"

UNITED NATIONS, Sept. 7 (Xinhua) -- Air pollution is a global emergency, UN Secretary-General Antonio Guterres said on Thursday, urging the international community to act together for clean air.

Guterres made the appeal in his message to mark the International Day of Clean Air for Blue Skies, which falls on Sept. 7 annually.

He pointed out that 99 percent of humanity breathes air laced with soot, sulphur