China 'winning' war on smog, helping life expectancy

China 'winning' war on smog, helping life expectancy
Based on daily data from more than 200 monitors across China from 2013 to 2017, the analysis found that cities have cut levels of PM 2.5 – the tiny airborne particles considered most harmful to health – by an average of 32% in just four years. If sustained, such reductions would increase the life ...