The haze weather in B city is mainly caused by pollutants such as fine particles (PM2 5), nitrogen hydrocarbons and respirable particles (PM10)  Statistical research shows that the number of haze weather in B City last year was much lower than that of the previous year, and it was the largest decline since the relevant statistics were available
However, statistical surveys show that public concern and anxiety about the haze weather in City B has greatly increased in the past year
In city B, some people who are anxious about haze weather live in areas with serious PM2.5 pollution