Pollutants emitted by gasoline-fueled vehicles are not the most critical source of urban air pollution.
Reductions in pollutants emitted by individual vehicles have been offset by increases in pollution from sources other than gasoline-fueled vehicles.
20. which of the following most closely parallels the situation described in the first sentence of the passage?
Although a town reduces its public services in order to avoid a tax increase, the towns tax rate exceeds that of other towns in the surrounding area.
Although a state passes strict laws to limit the type of toxic material that can be disposed of in public landfills, illegal dumping continues to increase.
Although a towns citizens reduce their individual use of water, the towns water supplies continue to dwindle because of a steady increase in the total population of the town.
Although a country attempts to increase the sale of domestic goods by adding a tax to the price of imported goods, the sale of imported goods within the country continues to increase.
Although a country reduces the speed limit on its national highways, the number of fatalities caused by automobile accidents continues to increase.
21. The author describes which of the following as the most appealing feature of methanol?
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