ENV200H1 Lecture Notes - Lecture 8: Tropospheric Ozone, Ozone Depletion, Haloalkane
Document Summary
Ozone (compound o3: pollutant in troposphere: having ozone in th troposphere is bad. Ground level ozone (fog in the streets) Its good in the stratosphere shield"s earth from uv radiation and so it is essential for human life protection. In 1976 thinning of ozone over antarctica noted and hit record low lvls in 2000. Effects of ozone depletion: more uv radiation reaches earth (this is bad, damage to ecosystems; they break down plant material, human health problems. Causes of ozone thinning: cfcs (manmade chemical) halons industrial solvents, first used in 1960, these chemicals were cheap and easy to use/produce, were eventually banned. Recovery of the ozone layer: 1987 montreal protocol-phase out cfcs, by 07 191 countries participating. Industry substitutes such as hydroflurocarbons od not attack ozone but are potent greenhouse gases: most countries have phased out hcfcs, long residence time (estimate 70-100 years, the single most successful international agreement to date. Climate change (weather and climate: weather.
