Pima County Government Logo
  • Increase font size
  • Decrease font size
  • Print
  • RSS
  • Tire Pressure and Temperatures Drop Together

    Oct 06, 2020 | Read More News
    Share this page
    Pima County, Ariz. – (October 6, 2020) Cooler temperatures have finally arrived, after an extended summer of record breaking heat! The long-awaited dip in temperatures this weekend will cause a drop in our tires’ air pressure. Science teachers taught us that air expands when heated and contracts when chilled, so there is less air pressure in your tires when temperatures drop. Pima County Department of Environmental Quality (PDEQ) recommends checking your vehicle’s tire pressure when temperatures get chilly.Check Tire Pressure
    For every 10 degree Fahrenheit change in air temperature, tire pressure will change about 1-to-2 two pounds per square inch (PSI). This can result in a drop of about 5 PSI, which is enough to negatively affect vehicle handling, traction, gas mileage and tire durability. Monthly tire pressure checks, along with a special check when temperatures drop suddenly, will improve driving safety, save you money at the gas pump and reduce tailpipe emissions.

    Vehicles equipped with Tire Pressure Monitoring Systems warn drivers when tires are about 25 percent under-inflated. This warning can be too late to prevent damage caused by under-inflation, so regular checks with a tire gauge are still important. 

    Where do you find the correct tire pressure for your particular vehicle? Don’t look for it on the side wall of the tire! That number is the maximum amount of air pressure the tire can hold. Every vehicle has its own ideal PSI, which is usually printed on the inside of the driver’s side door jamb, in the trunk or the glove box. This PSI number also can be found in the owner’s manual. 

    Maintaining your tires at the right pressure will:
    • provide a smoother ride;
    • reduce tire drag on the road, which wears tires out faster and causes the engine to burn more gasoline;
    • save you money at the gas station;
    • improve vehicle safety and handling; and
    • reduce vehicle emissions for healthier air.
    PDEQ operates the Pima County Waste Tire Collection Facility and receives more than 63,000 waste tires for recycling every month!  Five waste tires can be brought to the facility by Pima County residents for free every year. Proper tire inflation can prevent wear and the need for premature disposal at our facility. 

    For more information on the benefits of proper tire inflation, visit the PDEQ Clean Air Program’s Pump Up Your MPG campaign.