Question

why do some states require emissions testing? a to reduce air pollution b to reduce water pollution c to conserve energy resources d to increase fuel efficiency please select the best answer from the choices provided o a o b o c o d

Explanation:

Emissions testing is mainly about vehicle - emitted pollutants into the air. By detecting and regulating emissions, air pollution can be reduced. Water pollution is not related to emissions testing. Conserving energy resources and increasing fuel efficiency are not the main purposes of emissions testing.

Answer:

A. to reduce air pollution