Over a three-year period, a city's environmental protection department measured the particulate matter (PM2.5) in a ten-square-mile area around one of the city's coal-fired power plants. The annual mean level of PM2.5 measured was 20.0μgm3 over the three-year study period. The National Ambient Air Quality Standard (NAAQS) for PM2.5 is an annual mean level of 12.0μgm3, averaged over three years. The city instructs the manager of the power plant to propose a plan to aid the city in meeting the NAAQS for PM2.5 in the area around the power plant over the next ten years.Which of the following would be the most effective plan for the manager to propose to the city?AInstall catalytic converters at the plant.BInstall vapor recovery nozzles at the plant.CInstall electrostatic precipitators at the plant.DBurn lignite coal instead of bituminous coal at the plant.

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