It was a beautiful morning as I made the one hour drive from Reno, Nevada to the small rural mountain valley community of Portola, California. Each turn brought increasingly picturesque views of mountains, forests and lakes. As I started my descent into the city, I noticed a slight haze in the valley. Could it be fog? Was it an oncoming storm? Perhaps a forest fire? At another time of year, it might have been any of these natural causes. But at this time of year – early March, temperatures in the 30’s, no wind – it was none of these. What I was seeing hovering in the valley was a layer of smoke, and I was going to be spending my day discussing the environmental, economic and health benefits of reducing it.