Some sources of air are plants and trees, because they give of oxygen and air. Without trees, there will be no air and we will not be able to breathe. The atmosphere is also a source of air and oxygen it is the mixes of air around us; we can not taste or feel it. Without air, there will be no living life on the earth, (Animals or Plants). It shields us from harmful rays from the sun, and allows us to hear. We could not do anything without air (“Air” Hendreson).
There are many threats to air. This web-site is focusing on smoke stacks and car pollution. Smokestacks pollute the air by putting chemicals like nitrogen dioxide and sulfur dioxide into the air. Those particles in the air can keep the sun's heat from the ground, or prevent it from getting back into the open air again. That warms the air and the earth causing the green house effect. The green house effect is made worse by carbon monoxide from automobiles getting trapped in the warm atmosphere.
Cars not only make the green house effect made worse, but also pollute more from their exhaust. In their exhaust is carbon dioxide, carbon monoxide, nitrogen oxides, and tiny solid particles including lead from gas additives called particulate ("Air Pollution").
Some solutions to protect the air from air pollution are to make safer factories, cutting down car pollution, stopping air pollution at home, and looking at the big cars before you buy them to see if the do not pollute a lot. All of these can be very helpful to help cut down air pollution.
Some ways to help cut down factory air pollution is to have the smokestacks be taller then the surrounding buildings and hills, so that the gasses can rise above (Snodgrass).
A way to help stop car pollution is to have car emissions for cleaner air (Local Authorities). To stop air pollution at you can take trash to a land fill, recycle usable materials and compost leaves and sticks rather then burning them (Snodgrass).
If everyone who drives a car use their car 30% less, then air pollution will be helped both globally and locally. Since larger cars pollute more, you should try not to buy those kind of cars. Car emissions are going up in Canada and the America despite all of the attempts to make more fuel-friendly engines. The average new vehicle in 2000 uses more fuel then the same type of car in 1989 (Air Quality, Airborne Illness).