Lecture 1 (Week 12) 0.0 / 5 ? GeographyAir QualityUniversityNone Created by: JasminexxxxxCreated on: 18-04-21 19:43 Air Pollution Definition Air Pollution is defined as a mixture of gases and particles that have been emitted into the atmosphere by man-made processes 1 of 8 The main categories of air pollution - Indoor air pollution - Outdoor/ambient air pollution 2 of 8 Economic dimension to who is impacted -Disproportionately poorer households in rich countries -More common in low and middle-income countries 3 of 8 CASE STUDY - PITTSBURGH (1900s) In 1948, a four-day temperature inversion in a nearby town of 13,000 people resulted in 20 deaths and 6,000 cases of severe respiratory disease 4 of 8 Smog Definition A mix of smoke and fog 5 of 8 CASE STUDY - LONDON SMOG -One of the worst cases known was the Great Smog of December 1952 -4000 deaths -Coal-burning fires 6 of 8 Clean Air Acts 1956 and 1968 -Emissions of black smoke banned -Introduced requirement for use of smokeless fuels 7 of 8 Particulate matter (PM) defined according to size -PM10: < 10 µm in diameter -PM2.5: < 2.5 µm in diameter -PM1: < 1 µm in diameter 1 µm = 1 micron = 1/1000th of 1 mm PM may be organic or inorganic 8 of 8
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