Bell Ringer Name the four layers of the atmosphere and describe the temperature in each layer. Troposphere: decreasing temp. weather Stratosphere: increasing temp. Ozone layer Mesosphere: decreasing temp. Coldest layer Thermosphere: increasing temp. ionosphere

Chapter 23 The Atmosphere Section 1 Characteristics of Atmosphere Notes 23-3

Air pollution Any substance in the atmosphere that is harmful to people, animals, plants or property Sulfur dioxide Carbon monoxide Lead Hydrocarbons Ozone

Air pollution Effects EPA’s Health Effects of Air Pollution Long-term effects on health Decreases one’s ability to resist many diseases EPA’s Health Effects of Air Pollution http://www.epa.gov/oar/oaqps/air_risc/3_90_022.html

Air Pollution Sources Produces Burning of fossil fuels Before automobiles, factories and homes burning coal was the top cause Today it comes from burning coal and petroleum fuels Produces Sulfur dioxide, hydrocarbons, nitrogen oxide, carbon monoxide and lead

Air Pollution Acid Rain Pollutants in the air when combined with water in the atmosphere causes acid rain Falls to the ground in the form of rain, snow, sleet or mist Can kill crops and other plants, poison fish and ruin soil

Air Pollution Temperature Inversion: When warm air traps cold air at the surface of the earth This doesn’t allow for air circulation Normally warm air is at the surface and cold air is above it Pollution also gets trapped Produces smog Combines smoke and fog

Air Pollution Temperature Inversions Topography can make it worse In Los Angeles, cool Pacific air, that is polluted, is trapped. Mountains that boarder the city keep air from circulating

Temperature Inversion

Homework Section Review p. 462 1-4