Why can weather forecast predict air pollution?

Whether air pollutants exceed the standard is actually determined by two factors, one is emission and the other is removal. The more emissions, the heavier the pollution; The more it is removed, the lighter the pollution will be. At present, in a city like Beijing, the daily emissions may have approached or exceeded the environmental capacity of the city (that is, to ensure that the city cannot reach the maximum capacity of pollution concentration), so whether the air really reaches the pollution level depends mainly on the cleaning process. There are many kinds of removal processes, including chemical degradation (of course, atmospheric particles are unlikely to degrade), dry and wet deposition (precipitation, snowfall, direct deposition of particles or gases to the surface) and so on. ), diffusion (actually the wind blows) and so on. Obviously, whether it is raining, snowing or windy, these processes are related to the weather process, which largely determines the final concentration of pollutants in the city. So the weather forecast can forecast air pollution by the way. Of course, most of these forecasts are qualitative at present, so there may be times when the forecast is inaccurate (even the weather forecast itself is inaccurate, not to mention the air quality forecast based on the weather forecast results).

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