Saturday, March 25
The map below is a 1-hour snapshot. Click to view all hours recorded since midnight.
Keep your car well-maintained - get regular tune-ups
The engine will pollute less, run smoothly and save you money.
Change the fuel filter and air filter at least once a year, or every 12,000 miles
A dirty air filter has restricted air flow causing the engine to operate less efficiently.
Keep tires properly inflated and aligned
This will reduce emissions and save fuel.
Fill up your gas tank after sunset
This will keep evaporative emissions from reacting with sunlight to form ozone pollution (smog).
Don't top off your tank when you refuel
It may cause spillage, which evaporates and contributes to smog.