Air Quality
Think about how many cars are on the road, how many people use hairspray or how many factories there are around the planet, and you will start to understand how the environment is experiencing a problem with air quality. Poor air quality -- think smog -- can impact human health, since humans breathe the air to survive. Asthma and respiratory problems may become more common as a result. The ozone layer cannot be repaired once the damage is done, so air quality continues to be an environmental problem.