How would you define air pollution

Air Pollution is when the smoke from factories ect make the air unclean animals also affect air when they die or are killed.

As the boys sleep, military airplanes battle fiercely above the island. none of the boys sees the explosions and flashes in the clouds because the twins sam and eric, who were supposed to watch the signal fire, have fallen asleep. during the battle, a parachutist drifts down from the sky onto the island, dead.