in 100 words one paragraphDescribe the distribution of pm25 concentration in China

The distribution of PM2.5 concentration in China varies significantly across the country. In major cities like Beijing, Shanghai, and Guangzhou, the PM2.5 levels tend to be consistently high due to industrial activities, traffic emissions, and coal-fired power plants. These densely populated urban areas experience severe air pollution, with PM2.5 concentrations frequently exceeding safe levels set by the World Health Organization. In contrast, rural areas and remote regions generally have lower PM2.5 levels due to fewer industrial sources. However, certain areas, particularly in northern China, are heavily affected by winter air pollution, known as "smog," caused by coal burning for heating purposes. Overall, the distribution of PM2.5 concentration in China reflects the complex interplay between industrialization, population density, and environmental policies