ES101 Lecture 5: 1.5 Pollution
15 Jan 2018
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Document Summary
Pollution : is the presence of substances at high enough levels in the air, water, soil, or food to threaten the health survival and activities of humans and organisms. Air quality index used to measure pollutants levels in six levels. Pollutants categorizes in two categories (1)natural (2) human (activity near industrial areas) Pollutants can travel for great distances through the air and water and contaminate many other regions beyond where these pollutants come from. For example contamination from ohio mainly greatly affects southern ontario. Pollutant can occur naturally through volcanic eruptions. Control of pollution two general sources of pollution. Point source: of pollutants identifiable sources (e. g coal burning, drainpipe of factory. Non-point source: are pollutants are dispensed and difficult to identify (e. g pesticides sprayed in air blown into atmosphere and can runoff into into farmlands and rivers streams and lakes. We often do not want to deal with environmental issues before they become full on crisis.
