Air Pollution (continued) Chapter 18 Ahrens Monday, 30 November Class #37 1Monday, November 30.

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Air Pollution (continued) Chapter 18 Ahrens Monday, 30 November Class #37 1Monday, November 30

Review sheet for test #5 Ahrens – Chapter 2, pages – Chapter 3, pages and – Chapter 4, pages – Chapter 18, pages Monday, November 302

Primary and secondary pollutants Primary air pollutants enter the atmosphere directly from their sources – Examples are carbon monoxide and sulfur dioxide Secondary air pollutants form only when a chemical reaction occurs with primary air pollutants – Examples are photochemical oxidants and acid deposition – Secondary air pollutants are more difficult to control Monday, November 303

Santiago, Chile Monday, November 304 Fig. 18-CO, p. 500

Table 18-1, p Monday, November 30

Fig. 18-3a, p Monday, November 30

Fig. 18-3b, p Monday, November 30

Table 18-2, p Monday, November 30

Fig , p Monday, November 30

Stepped Art Fig , p Monday, November 30

Table 18-3, p Monday, November 30

Fig , p Monday, November 30

Fig , p Monday, November 30

A secondary pollutant: smog/photochemical oxidants/ozone Smog originally meant smoke and fog Now smog refers to the chemical soup created by sunlight acting on hydrocarbons (VOCs) and oxides of nitrogen in the presence of oxygen and sunlight Ozone is the main constituent of smog, but there are many others, including PAN Smog attacks the respiratory system Monday, November 3014

Fig. 18-6, p Monday, November 30

Secondary air pollutant: acid deposition Acid deposition: can be dry or acid rain, snow, fog, dew – Oxides of sulfur, oxides of nitrogen combine with water vapor or liquid water drops in the air – Sulfuric acid, nitric acid form – Acid attacks structures and plants – In bodies of water, acid allows heavy metals to leach out and contaminate water supplies, toxify water for fish and other living things Monday, November 3016

Fig , p Monday, November 30

Fig , p Monday, November 30

Fig , p Monday, November 30

Fig , p Monday, November 30

Fig , p Monday, November 30

Fig a, p Monday, November 30

Fig b, p Monday, November 30

Fig , p Monday, November 30

Fig. 4, p Monday, November 30

Fig. 4a, p Monday, November 30

Fig. 4b, p Monday, November 30

Fig. 4c, p Monday, November 30

Fig. 4d, p Monday, November 30

Fig. 4e, p Monday, November 30

Fig , p Monday, November 30

Fig , p Monday, November 30

Fig , p Monday, November 30

Stepped Art Fig , p Monday, November 30

Fig , p Monday, November 30

Fig. 5, p Monday, November 30

Ingredients for an episode of air pollution Many sources of air pollution close together A deep stationary high-pressure area Light surface winds that limit dispersion A strong subsidence inversion A shallow mixing layer with poor ventilation A valley where pollutants can accumulate Clear skies, radiational cooling at night, and a surface inversion Monday, November 3037

Table 18-4, p Monday, November 30

Fig , p Monday, November 30

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