Before and After

Joost de Gouw recently showed us this photo. It comes from a recent Colorado State University press release and shows the difference in visibility in Great Smoky Mountain NP over the last 15 years. One of the SOAS ground sites will be in GSMNP at Look Rock. It looks like previous studies in the SE United States such as SOS and SEAVS enabled *effective* regulation to improve air quality.

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