It's not a bad article. Wood smoke in urban areas and in natural geographic bowls that trap smoke during temperature inversions are real issues. But they are not as universal as the article might suggest. For example, the article mentions Keene, NH. Here is what today's air looks like with wood heating on a 35º ambient temp day.
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Here is for Libby, MT today.
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Portland in the area mentioned by the article right now
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Urban pollution is complex. I feel for the Portland resident. That is an industrial and airport area. Having a neighbor that runs a stove or fireplace poorly is adding insult to injury. However, not to be flippant, but I also wonder about the effects on her health from the multiple long summer stretches where wildfire smoke choked the Portland area with astoundingly high PM2.5 numbers. That surely did not help her situation. Additionally, Portland has an ozone problem in warmer weather and apparently that is getting worse due to climate change. Part of the solution there is to switch to cleaner power generation and electrifying transportation.
The best thing we can do is to personally burn cleanly and help educate others on how to do so. Setting moisture content standards for firewood and greater public education on proper burning practices would also help.