1.   A private citizen could be fined between one and ten times the average monthly wage if it was found that a car was emitting excessive levels.

2.   But before it reached the speed traps, the car emitted a flame out the back.

3.   Cars emit more ingredients that cause smog when they go faster because they use more fuel.

4.   Cars emit nitrogen oxides, which mix with organic compounds in warm, sunny weather to form ground-level ozone.

5.   Current federal regulations allow cars to emit four-tenths of a gram of smog-causing nitrogen oxides for each mile traveled.

6.   On hot summer days, parked cars emit hydrocarbons that add to ozone pollution, just like cars stuck in traffic jams do.

7.   The inventions reduce the noxious chemicals that cars emit, by first filtering hydrogen from the exhaust through a conditioning catalyst.

8.   The pollutants their cars emit lurk near the ground and are converted to ozone by sunlight the following day.

9.   Electric cars emit none of the exhaust fumes that are a major cause of global warming.