Previously, with the continuous foggy weather in many parts of the country, “PM2.5” has become the hottest word in popular science. The main reason for the “explosion” of the PM2.5 value this time is the large emissions of sulfur dioxide, nitrogen oxides and dust caused by coal burning. As one of the current sources of PM2.5 pollution, the exhaust gas emissions of coal-fired boilers are very prominent. من بينها ، يمثل ثاني أكسيد الكبريت 44 ٪ ، وتمثل أكاسيد النيتروجين 30 ٪ ، وتمثل الغبار الصناعي وغبار الدخان 26 ٪. علاج PM2.5 هو بشكل أساسي إزالة الكبريت الصناعية وعدم النترج. On the one hand, the gas itself will pollute the atmosphere, and on the other hand, the aerosol formed by nitrogen oxides is an important source of PM2.5.