Which of the four pollutants illustrated in the bar graphs below shows the greatest decline from Location 1 to Location 2? Suppose a scientist hypothesized that the overall level of air pollution at Location 2 will be lower than at Location 1. Do the data presented in these bar graphs support this hypothesis? Why or why not?

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High High Low Low Location 1 Location2 Formaldehyde ■ Radon sulfuric acid ■ Methane