Scientists call the gases and fumes a layer of smog. The smog is really a layer of ozone. It is just that it is too close to the surface and effects our breathing. Not only does the smog effect our breathing, but it also eats away at buildings.

Carbin dioxide is let out by cars and factories. The amount of carbon dioxide has doubled and may cause global warming

As we go into the future, scientists are making new cars that won’t pollute the air so much. A car that is already made runs on batteries. Electricity is considered an alternative fuel because it is a renewable resource, inexpensive, better for the environment, and safe to handle. Cars that run on electricity are being invented. These cars may prove to be better for the environment.

Factories also hurt our environment. Some factories burn soft coal, which causes acid rain.