The latest eruption at Kilauea has increased the amount of vog on the big island of Hawai'i. Vog is more or less the same as the anthropogenic "smog" produced by car/industrial exhaust, but produced by volcanic gases (carbon dioxide, carbon monoxide, sulfur dioxide, hydrogen sulfide amongst others). It definitely doesn't make for good air quality, especially with the current lack of strong tradewinds in Hawai'i right now.
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