AOSC200Lect25

AOSC200Lect25 - AOSC 200 LESSON 25 Air Pollution William...

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Unformatted text preview: AOSC 200 LESSON 25 Air Pollution William Shakespeare 1564-1616, from his play ‘Hamlet’ Air Pollution Air Pollution History of Air Pollution • Air pollution is not a new problem • In England, wood for burning became scarce, and the populace resorted to burning coal which had a high sulfur content. The by-products were soot (carbon particles) and sulfur dioxide. • John Evelyn in 1661 wrote about the notorious London pea-soup fog. These occur in the fall when the Thames is warm but the ground is cold. The natural fog this produces is enhanced by the extra soot particles, and the sulfur dioxide reacts in the water droplets to produce sulfuric acid. London Killer Smog SMOG • Word coined by Dr. Harold Des Veaux, a London physician in 1903. • SMOKE + FOG = SMOG • He meant London smog – sulfurous fumes from coal burning + large water droplets formed around smoke particles (soot) • 1952 – Killer smog – 4000 deaths. Another episode in 1956 led to 1000 deaths. • Similar events have also occurred in the US. • Large industrial cities such as St.Louis and Pittsburg also suffered from ‘London’ smog, as the use of coal increased. PHOTOCHEMICAL SMOG • In 1940 vegetable crop damage began to be seen in the Los...
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AOSC200Lect25 - AOSC 200 LESSON 25 Air Pollution William...

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