Air Pollution. Chapter 20. Sections 20-1 & 20-2. We live at the bottom of a thin layer of gases surrounding the earth Atmosphere The Atmosphere is made up of several layers We live in the troposphere Above the troposphere is the stratosphere. Troposphere 1 st layer of atmosphere
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In the diagram, notice that as altitude decreases, the atmospheric pressure increases.
Another graph: As altitude decreases, atmospheric pressure increases.
How ozone is created
U.S. cities typically have higher outdoor pollution levels than rural areas
Due to prevailing winds, the city pollutants are spread to rural areas
Indoor air pollutants come from infiltration of outdoor pollutions into the building
Photochemical Smog formation
Keep in mind that the warm air rises in the temperate / tropical areas and will condense once it reaches the colder temperatures (earth’s poles).
Effects of temperature inversion
Asian brown cloud (industrial smog)
2 miles thick
Caused by huge emissions of ash, smoke, dust, acidic compounds (from burning coal), burning trees (to plant crops), dust blowing from desserts
As the cloud travels it picks up many pollutants
Acid Deposition / Rain
Thermal Inversion demonstration
Thermal Inversion in the real world
Asia’s Pollution Super Cloud
Coal combustion & Acid Rain