Pollution: Ozone will play big role

PM2.5 will give way to PM10 as major component of coming smog

Ozone is forecast to be one of two major contributors to the smog expected to settle in areas of the Beijing-Tianjin-Hebei province region early this month, the top environmental authority said on Wednesday.

It will also be the only major pollutant for mild or moderate air pollution expected to occur in many other parts of the country, the authority said.