ENV100Y5 Lecture Notes - Lecture 42: Tropospheric Ozone, Tropopause, Radon
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ENV100Y5 Full Course Notes
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Document Summary
Session 45: air pollution and stratospheric ozone depletion (i) Outdoor air pollution affects climate and harms people and ecosystems. Air pollutants = gases and particulate material added to the atmosphere. Has decreased in recent decades due to government policy and improved technologies in developed countries. Developing countries and urban areas still have significant problems. We still need air quality protection here, too. Nitrogen is 78. 08% of atmosphere, and 20. 95% of the atmosphere is oxygen. Most variable = water vapour; 2nd most variable = aerosols from a variety of sources. Aerosols are tiny droplets and tiny particles (solid particles and liquid droplets). They affect the atmosphere and they can be dangerous in many ways. Many pollutants are aerosols, which vary in both time and space. Atmospheric aerosol profile: altitude goes up and pressure decreases with altitude, and concentrate increases to the right. Concentration of aerosols from ground levels to 30 km in atmosphere (higher in the ground, lower, then higher again).
