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The EPA sets national air-quality standards for common air pollutants. The data table shows the change in concentrations of these pollutants over time.
Which conclusion do the data support?

A. Monitoring concentrations of pollutants is too expensive.
B. With monitoring, the concentration of every pollutant has
decreased.
O c. With monitoring, the concentration of every pollutant has
increased.
D. Monitoring concentrations of pollutants has been ineffective.


The EPA sets national air-quality standards for common air pollutants. The

data table shows the c

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Answers: 2

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