Does inflating car tires with nitrogen help the environment?

EarthTalkTM

From the Editors of E/The Environmental Magazine

Dear EarthTalk: Is using nitrogen to inflate my car’s tires really better for the environment than using air? And if so, how? — Roger Mawdsley, Abbotsville, BC

Whether or not it makes environmental sense to inflate car tires with nitrogen instead of air is a matter of much debate. Proponents of nitrogen say the element is a smart choice for the environment primarily because it leaks from tires at a slower rate than air, so tires stay inflated longer at full capacity, which helps a vehicle attain maximum fuel efficiency, i.e. better gas mileage. According to the Get Nitrogen Institute, a Denver-based non-profit which advocates for replacing the air in our tires with nitrogen, under-inflated tires inadvertently are a big contributor to global warming as they cause drivers to waste fuel.

Although auto experts recommend checking your car’s tire pressure weekly, studies show that the majority of drivers rarely if ever check to see if their tires are properly inflated and usually only add air when a tire is visibly low or beginning to go flat. A recent study by the European division of tire maker Bridgestone found that 93.5 percent of cars in Europe have under-inflated tires, wasting some 2.14 billion gallons of high-priced, polluting fuel every year. Analysts believe that a similar percentage of North Americans are driving around on under-inflated tires as well.

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