Section 43657 Of Article 2. Certified Device Installation From California Health And Safety Code >> Division 26. >> Part 5. >> Chapter 3. >> Article 2.

. The state board may also exempt, from the schedule of installation adopted pursuant to Section 43655, any motor vehicle registered to an owner whose residence is in a county, or portion thereof, which the state board finds, after a public hearing, that the installation of a certified device pursuant to Section 43652 to control exhaust emissions is not necessary or desirable to preserve and protect the public health and the existing ambient air quality thereof.