Large-scale large-scale pollution that targets a region or a city is called regional pollution or urban pollution, which is the focus of Chinas current environmental protection work. Small-scale pollution that targets a single chimney or po...... …

Freon, that is, increasing global emissions of chlorofluorocarbons (CFCs) and carbon dioxide (CO2), are mainly caused by the increase in ozone layer depletion and global warming....... …

I. Pure atmosphere The atmosphere refers to the entire space formed by the air surrounding the earths surface, and its thickness is 1000 ~ 1400km. Atmosphere refers to the space between one or all of the gases occupying the atmosphere, or t...... …

On the basis of the separation mechanism of dust particles in the gas, a separation device is designed, which is a dust collector, also called dust collection, and a separation device is designed, which is a dust collector, also called a du...... …

Wear of dust on machinery and equipment The dusty air stream collides with the wall surface during movement, causing cutting and rubbing, causing wear. Dust in the dust-laden airflow The dust-laden airflow collides with the wall surface dur...... …

The dust particles in the air may themselves be chemically inert or sexual. If they are inert, they can also absorb chemically active substances from the atmosphere, or they can synthesize a variety of chemically active substances....... …