Coal fired boiler replacement in Beijing rural area
The PM2.5 Beijing decreased from 110ug/m3 to 58ug/m3.
Blue skies showed up again in winter of Beijing in 2017.
In 2016 and 2017, the coal fired boiler replace program, “coal to clear heating program”, supported around 500,000 units air source heat pump installation in Beijing. And reduce more than 2 million tons coal usage.