In 1956, Great Britain passed a Clean Air Act, requiring the use of cleaner fuels, better furnaces, and electric heat. The United States Congress passed the first Clean Air Act in 1963. The last several decades have seen a tremendous increase in the use of automobiles. Today, motor vehicles are the leading cause of air pollution. Exhaust from motor vehicles contain many toxic pollutants, including carbon monoxide.
Automobiles are also a source of particulate matter and ground-level ozone.
Using a ruler to measure, cut a strip of posterboard or cardboard that is two inches wide and ten inches long. Cut five holes, each about an inch in diameter, in the strip. Use the ruler to find a round object of the right diameter or use a compass to draw the circles. Use a hole punch to put a small hole in one end of the strip. Put long pieces of clear tape over one side of the strip.