San Luis Obispo County Air Pollution Control District

Sandra Foyt/Flickr

San Luis Obispo County’s Oceano Dunes is a complex of coastal sand dunes with a 5.5-mile stretch of drivable beach, the only place in California where it’s legal to drive off-highway vehicles along the water's edge. In an effort to control air pollution in the area, there will soon be about 100 fewer acres on which to go four-wheeling at Oceano Dunes State Vehicular Recreation Area.