EXAMPLES OF ATMOSPHERIC TRANSFORMATIONS OF PRIMARY POLLUTANTS TO SECONDARY POLLUTANTS
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FIGURE 13.3 The primary pollutants—sulfur dioxide (SO2), nitrogen oxides (NOx), and volatile organic compounds (VOCs)—undergo chemical reactions in the atmosphere, resulting in the secondary pollutants, sulfuric acid (H2SO4), nitric acid (HNO3), and ozone (O3).