Source:
https://scmp.com/news/china/policies-politics/article/2141259/harmful-ozone-pollution-worsening-northern-china-saysPolitics
Harmful ozone pollution worsening in northern China, says study
Traffic congestion a major cause of the pollutant, with concentrations up 40 per cent or more in 10 northern cities, according to university report
A heavily polluted day in Beijing earlier this month. Photo: EPA-EFE
Concentrations of hazardous ground-level ozone have worsened in northern China despite countrywide efforts to tackle air pollution, according to a study published by Peking University.
Stringent winter restrictions on industry, transportation and coal consumption enabled smog-prone northern Chinese regions to meet politically crucial air quality targets for the 2013-2017 period.