Human-made air pollution comes from many things. Most air pollution made by humans today is because of transportation. Cars, for instance, make about 60% of the human-made air pollution. The gases inside car exhaust, like nitrogen oxide, make smog and acid rain.
The average price of a new car in America tops $33,000, according to car-buying site Kelley Blue Book, so buying a vehicle is a major financial move. While many consumers focus on sticker price or the monthly payment, that overlooks many other costs.
The price of gas may go up or down, but it's always a major expense for anyone who drives a car. The average American consumer spends about $3,000 per year for gas, according to the American Automobile Association. Driving a smaller car makes a great difference â the cost per mile is about half for a small sedan than for a large SUV. Similarly, drive with a less powerful engine than you need. Don't pay for an eight-cylinder engine when four cylinders will work just fine. Unless you're hauling heavy loads on a routine basis, the extra cost of a bigger engine results in more money spent on gasoline.