Read the map of the mid-latitude area, analyze and answer the following questions. (1) This area is affected by _ _ _ _ _ _ weather system. If phosphorus is present in the precipitate,

(1) cold

Read the map of the mid-latitude area, analyze and answer the following questions. (1) This area is affected by _ _ _ _ _ _ weather system. If phosphorus is present in the precipitate,

(1) cold front? Snowfall? Draw as follows

(2) As a condensation nucleus, smoke promotes the condensation of water vapor, and acidic gas dissolves in water to produce acidic precipitation (acid rain, acidic snow).

(3) The air quality is poor. The air above P is affected by warm air, and the air at low altitude is affected by cold air, which makes the air at P warm up and cool down, forming an inversion phenomenon, inhibiting air convection, and the influence of basin topography makes it difficult for air pollutants to spread. Pollutants in the atmosphere accumulate and air quality declines.

According to the change of isotherm in the figure, it can be judged that the area is affected by cold front, and snowfall may occur because the temperature of cold air mass is below 0 at this time.

Air pollutants discharged from factories become condensation nuclei, which promotes the condensation of water vapor; At the same time, acidic gas is dissolved in water, resulting in acidic precipitation.

Due to the influence of frontal system inversion and basin topography, it is not conducive to the convection and diffusion of polluted air.