superfog

American  

[soo-per-fawg, fog] / ˈsu pərˌfɔg, ˌfɒg /

Or super fog

noun

1. a combination of fog generated by weather conditions and wildfire smoke from damp, smoldering brush, leaves, trees, and other organic materials that often reduces visibility to less than 10 feet.

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Etymology

Origin of superfog

Coined in 2003 by U.S. researcher Gary L. Achtemeier; super ( def. ) + fog ¹ ( def. )