We’re having one of those Bay area hot spells that come in late September or October. As I drove across the San Mateo Bridge, I looked ahead at the Peninsula. The hills of the Coastal Range were pale blue in the haze. I could see horizontal bands where the hills were more or less obscured: temperature inversions. When I got back to San Mateo and rolled down the car windows, there was a faint smell of smog in the air, and the temperature must have been over ninety degrees. And it’s supposed to be hotter tomorrow. And it’s supposed to continue for several days….