An auto air purifier can make your travel time more pleasant and reduce the harmful effects of pollution, pollen and dust. The wide variety of purifiers and refresheners available may seem confusing at first, but a few quick measurements and answers make the task easy. Whether you are trying to eliminate odors, keep from sneezing or simply prefer fresher air in your car, think about plugging in an auto air purifier.

Things You'll Need:

• Tape measure

Measure the clearance around the cigarette lighter plug-in socket on your dashboard. Check the amount of space from the edges of the socket to other dash appliances such as the radio and fan vents. The amount of available clear space will determine if you can accommodate a one-piece purifier or if you will need an auto air purifier with a cord.

• Step 2

  List your priorities for car air refreshment. If your goal is to eliminate odor from smoking, consider a negative ion air purifier. Tackle road air pollution with an ozone air purifier. For allergies, think about investing in a HEPA-filter purifier module.

• Step 3

  Determine if you need the lighter socket for other uses while driving. If you charge your phone or use a portable music player you need to find an auto air purifier with a built in socket extension.

• Step 4

  Compare prices for auto air purifiers sold in auto supply stores and online vendors. Include any taxes, cost of shipping and the return policy of each type.

• Step 5

  Select the most cost efficient car air purifier to meet your identified needs. Use the purifier for at least two weeks and replace it with another if the original does not accomplish its promised effectiveness.