Shijiazhuang lays out tougher plan for emissions

Shijiazhuang, the city with the worst air quality over the past two months, launched a campaign on Thursday with its toughest measures of the year.

The campaign will last until the end of the year and aims to reduce the city's average annual concentration of PM 2.5 - small particles that are harmful to the lungs - by 10 percent from last year's level, according to the plan released by government of Shijiazhuang, capital of North China's Hebei province.

The goal was originally set at the beginning of the year.