The level of air pollution is higher at a busy traffic intersection. Why?
Answer:
A large number of automobiles stop for a short period at red light through out the day and release a large quantity of gases which create air pollution.
The level of air pollution is higher at a busy traffic intersection. Why?
Answer:
A large number of automobiles stop for a short period at red light through out the day and release a large quantity of gases which create air pollution.