The Environmental Protection Agency asks you to help them understand the causes of urban pollution. Air pollution problems are worse the higher the Air Quality Index. You develop the following two hypotheses. Hypothesis I: Air pollution will be a greater problem as the average temperature increases in the urban area. Hypothesis II: Air pollution will be a greater problem as the population increases in the urban area.
Test each hypothesis with the facts given in the following table. Which hypothesis fits the facts better? Have you developed atheory?

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Metropolitan Statistical Area Days with Polluted Air Average Maximum Temperature Population (thousands) 30 13 12 24 Cincinnati, OH El Paso, TX Milwaukee, WI Atlanta, GA Philadelphia, PA Albany, NY San Diego, CA Los Angeles, CA 64.0 77.1 55.9 72.0 63.2 57.6 70.8 70.6 1,979 680 1,690 4,112 5,101 876 2,814 9,519 20 80