Which statement about reducing smog levels is true?

• A. Use public transportation instead of your car
• B. Look for alternatives to gas-powered machines and vehicles
• C. Consider fuel efficiency when you buy a vehicle
• D. All of the above

Answer: (D)

Reducing smog levels comes from lowering emissions from the main sources people can influence: transportation and fossil-fuel powered equipment. Using public transportation cuts the number of vehicles on the road, reducing overall emissions per person and easing the load of pollutants that form smog. Looking for alternatives to gas-powered machines and vehicles helps eliminate emissions from lawn and garden tools, generators, and other equipment that run on fossil fuels. Considering fuel efficiency when buying a vehicle lowers emissions per mile by using fuel more efficiently. Each of these actions targets a different part of the pollution picture, so combining them yields the biggest impact on smog. Therefore, doing all of the above is the most effective approach.