Vog: nature can pollute too!

Volcanic eruptions can be cause serious air pollution issues.  Check out these links:
This is happening in Hawaii:
http://volcano.wr.usgs.gov/kilaueastatus.php
http://ap.google.com/article/ALeqM5gAZ8zB9AM756uRRnvQ9xTzpBRRfQD90FOQV00
Here is Chile:
http://www.msnbc.msn.com/id/24483158/
Maybe we should put scrubbers on those…

Ski resorts and artificial snow

Another issue to consider, is artificial snow good or bad for the environment?
http://query.nytimes.com/gst/fullpage.html?res=9C0DE2DF1431F937A25752C1A962958260
http://www.businessweek.com/globalbiz/content/apr2008/gb20080421_199362.htm
http://findarticles.com/p/articles/mi_m0CYP/is_/ai_77276469

So what do you know about vapor intrusion?

No, it is not somebody’s cheap cologne wafting into your space and causing your allergies to act up. 
It is a relatively new issue that arises in hazardous site cleanups and brownfield redevelopment.  After the source of the contamination is removed, the groundwater (http://en.wikipedia.org/wiki/Groundwater; http://www.groundwater.org/) remains.  Groundwater is found at different depths in different climates. The [...]