In the past there have been plane crashes and explosions linked to natural air. So, nitrogen has been used and there have been fewer problems associated with the tires. Nitrogen has also made it so the tires and wheels require less maintenance and last longer. In airplane tires studies have shown that pure nitrogen keeps its correct tire pressure 40% longer than regular air. This has also recently been proven in car and truck tires. Many large trucking and freight hauling firms have started using nitrogen to fill their tires as it can also make tires last longer (as nitrogen reduces moisture in the tires which will greatly reduce the chances of corrosion over time) and have a more even wear pattern (as long as other elements are operating normally like alignment, brakes and similar).
So, for a few dollars per tire you can now go to your local PepBoys, AAA or similar service center and they will fill your tires with nitrogen. This is best when used on new tires, not used tires. They will also give you the trendy green tire caps signifying to other drivers that you have had nitrogen in your tires. It is a novelty idea and worth it at a few dollars ($3 to $4), but shop around as some service stations and new car dealers are looking at this as a potential new profit source and are charging $10 or more dollars per tire for this service. With just a few phone calls you will easily find someone that will do it for much less. Just like any automotive service you should always call around and shop the prices of any repair or service as you can save a lot of money.
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