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That are quite small just like tobacco smoke or like a diesel emissions and here’s just one example love the fact above one household Fallout 4 having one wood burner and you can see this spreading over an area that that is now at this point in the photograph it's about almost half a mile wide andthe concentration particulars in this area because I worked out with scope if you can see wood smoke at this level the particular concentrations are likely to be a in the many multiples about that 15micrograms federal limit so that this is phenomenon that is increasing in prevalence and leading to really quite extreme.
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