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Which of the following are used by European countries to decrease air pollution? (multiple responses: mark all that apply)
Creating "smokeless" zones
Creating "smokeless" zones
Requiring strict emissions standards from auto manufacturers
Requiring strict emissions standards from auto manufacturers
Testing air quality regularly
Testing air quality regularly
Switching to hydroelectric, solar, and wind energies
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Which of the following are used by European countries to decrease air pollution? (multiple responses...
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