At a birthday campfire on the beach last July, I gazed into the orange flames and beyond, into a whorled orange sunset that melted sky into sea. I was starting to dissolve into the warm flow, to become one with all that oranginess, when the wind suddenly shifted, and I inhaled a cloud of smoke. The South Coast Air Quality Management District calls it PM 2.5s, or wood-smoke particulates, and it has drawn a lot of attention because of health concerns. My perfect moment was clouded with a somber thought: Is the campfire endangered?
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