(2) Air pollutants are harmful to plants, especially sulfur dioxide and fluoride. Make the surface of plant leaves scar, or directly make the leaves wither and fall off; Or cause chronic damage to plants, resulting in a decline in plant yield and deterioration of quality.
(3) Adverse impact on weather and climate: The impact of air pollutants on weather and climate is mainly manifested in the following aspects:
(1) Reduce the amount of solar radiation reaching the ground: A large number of smoke particles discharged into the atmosphere make the air very turbid, which blocks the sunlight and reduces the amount of solar radiation reaching the ground. According to observation and statistics, in the days when smoke and dust are not scattered in large industrial cities, the direct sunlight on the ground is reduced by nearly 40% compared with the days without smoke and dust.
(2) Increase atmospheric precipitation: Many emitted soot particles have the function of water vapor condensation nuclei. Therefore, when there are other precipitation conditions in the atmosphere, there will be precipitation weather. In the downwind areas of large industrial cities, there is more precipitation.
(3) Causing acid rain: This is because sulfur dioxide, a pollutant in the atmosphere, oxidizes to form sulfuric acid, which falls with the precipitation in nature. Sulfuric acid rain can destroy large areas of forests and crops, corrode and destroy paper products, textiles and leather products, degrade metal antirust coatings and reduce their protective effects, and also corrode and pollute buildings.
④ Increasing the atmospheric temperature: As a large amount of waste heat is discharged into the air, the air temperature near the ground is higher than that in the surrounding suburbs. This phenomenon is called "heat island effect" in meteorology and so on.