Hazy weather readings

According to the map, (1) the industrial bases in central and southern Liaoning and Beijing, Tianjin and Tangshan in China are smog-prone areas.

(2) In most areas of our country, coal-fired heating methods and automobile exhaust emissions have aggravated the formation of haze weather.

(3) Shout: "Environmental awareness, walk to work".

So the answer is: (1) Beijing-Tianjin-Tangshan; (2) Coal-fired heating mode; Urban motor vehicle exhaust emissions; (3) Walk to work.