The pollutants in the atmosphere have the characteristics of large changes with time and space. Understanding this characteristic is of great significance for obtaining monitoring results that accurately reflect the actual situation of air pollution. The temporal and spatial distribution and concentration of air pollutants are closely related to the distribution of pollutant emission sources, emissions, topography, geomorphology, and meteorological conditions. Meteorological conditions such as wind direction, wind speed, atmospheric turbulence, and atmospheric stability are always changing, so the dilution and diffusion of pollutants are also constantly changing
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