WAEC - Biology (1990 - No. 42)
Which of the following is not a way of reducing air pollution?
Siting factories and power stations away from residential areas
Building tall factory chimneys
Passing waste gases through filters and absorbers
Using lead-free petrol in cars
Recycling tins, cans and bottles
הֶסבֵּר
All the options contribute to the reduction of air pollution except option E which does not in any way reduce air pollution.