Smog is the combination of smoke and fog. Smoke
is the result of human activity such as burning of wood, coal, etc. This is a
result of air pollution. Breathing problems are the effects of air pollution
because it destroys the respiratory system. Global warming is also an effect of
air pollution. The consecutive production of carbon monoxide from
transportation vehicle, mismanagement of garbages contributes to global
warming. Soil erosion however is the result of fluid always passing on to that
area. This is not the result of air pollution. The answer is letter d.
