Chapter 16

As of January 1, 2006, Santa Maria has become the largest city in Santa Barbara County. The principal mountain ranges of the county are the Santa Ynez Mountains in the south, and the San Rafael Mountains and Sierra Madre Mountains in the interior and northeast. Most of the mountainous area is within the Los Padres National Forest, and includes two wilderness areas: the San Rafael Wilderness and the Dick Smith Wilderness. The highest elevation in the county is 6820 feet (2079 m) at Big Pine Mountain in the San Rafaels. North of the mountains is the arid and sparsely populated Cuyama Valley, portions of which are in San Luis Obispo and Ventura Counties.

Oil production, ranching, and agriculture dominate the land use in the privately owned parts of the Cuyama Valley; the Los Padres National Forest is adjacent to the south, and regions to the north and northeast are owned by the Bureau of Land Management and the Nature Conservancy. Air quality in the county, unlike much of southern California, is generally good because of the prevailing winds off of the Pacific Ocean. The county is in attainment of federal standards for ozone and particulate matter, but exceeds state standards for these pollutants. Sometimes in late summer and early autumn there are days with higher ozone levels; usually this occurs when there is a low inversion layer under a stagnant air mass, which traps pollutants underneath. In these cases a traveler into the mountains encounters a curious paradox: the temperature rises as altitude increases. On these days the visibility from the higher summits may be more than a hundred miles, while the population on the coastal plain experiences haze and smog.