Large-scale large-scale pollution that targets a region or a city is called regional pollution or urban pollution, which...... …

Freon, that is, increasing global emissions of chlorofluorocarbons (CFCs) and carbon dioxide (CO2), are mainly caused by...... …

I. Pure atmosphere The atmosphere refers to the entire space formed by the air surrounding the earths surface, and its t...... …

On the basis of the separation mechanism of dust particles in the gas, a separation device is designed, which is a dust ...... …

Wear of dust on machinery and equipment The dusty air stream collides with the wall surface during movement, causing cut...... …

The dust particles in the air may themselves be chemically inert or sexual. If they are inert, they can also absorb chem...... …