Environmental science A Study of interrelationships Unite 8 Air Quality Issues
Unite 8 Unite 8 Air Quality Issues Air Quality Issues Environmental Science Environmental Science A Study of interrelationships A Study of interrelationships
The Atmosphere Composition -About 99%of the clean, dry air in the troposphere consists of(2) gases: Nitrogen(79%)Oxygen (20%) Water vapor accounts for. 01% to 5% Most of the atmosphere is held close to the earth by the pull of gravitational force, thus it gets thinner with increasing distance from the earth
The Atmosphere • Composition - About 99% of the clean, dry air in the troposphere consists of (2) gases: Nitrogen (79%) Oxygen (20%). – Water vapor accounts for .01% to 5%. – Most of the atmosphere is held close to the earth by the pull of gravitational force, thus it gets thinner with increasing distance from the earth
The Atmosphere As the atmosphere absorbs heat from the earth, it expands and rises When heat is radiated into space Weste Convection currents air cools becomes more dense and flows toward the Trade winds earth
The Atmosphere • As the atmosphere absorbs heat from the earth, it expands and rises. – When heat is radiated into space, air cools, becomes more dense, and flows toward the earth
The Atmosphere Air quality degraded by multiple sources Air pollution includes both aesthetic and human health problems Accumulation uebec of air pollution
The Atmosphere • Air quality degraded by multiple sources. – Air pollution includes both aesthetic and human health problems. Accumulation of air pollution
100 Layers of the Atmosphere 90 80 870 ionosphere 060 850 ------- 40 Stratosphere 30 20 10 0