Ozone is formed when different types of air pollution mix together in sunlight on hot days.
The area has not violated the ozone standard for several years and is eligible to request removal from the nonattainment area list. Under federal law, this request must include a 10-year plan that will prevent ozone violations. The decision will be based on whether the plan meets EPA's legal and technical requirements. The Emission Check program would increase its focus on ozone-causing emissions. Test procedures would change to more accurately find problem vehicles and ensure proper repairs.