Generally speaking, haze in various parts of China is the product of a series of chemical and physical processes of pollution emissions from various sources, including primary emission, secondary chemical conversion and physical process  The situation from south to north is very complicated, and the current situation is different from that in London and Los Angeles  Some scholars have said that the situation in Beijing belongs to the compound type of London type and Los Angeles type  In fact, things are by no means a compound that can be summed up  What is also worrying is that at present, from top to bottom, all provinces and localities believe that coal burning is the root of the problem, and it seems that after the realization of urban combustion and gasification, the problem can be greatly solved
in fact, our primary emissions or secondary processes produce more than just sulfur dioxide, or add a nitrogen oxide
The reasons for the formation of haze are complicated