BEIJING — Air quality across China generally improved last year but remains a “major health hazard,” according to Greenpeace.
A new report ranking 366 of the country’s cities in terms of air pollution highlighted that there was still plenty of room for improvement.
“None of these 366 cities meet the World Health Organization’s air quality standard,” said Dong Liansai, a climate and energy campaigner for Greenpeace. “That is to say 100 percent of Chinese cities studied fail to meet the WHO’s standard.”
Annual average levels of PM2.5 — particulate matter of 2.5 micrometers in diameter that can penetrate deep into the lungs — dropped by 10.3 percent last…