not quite sure what your point is, Bill. smog 200 years ago? before the industrial revolution?? thanks environmentalists?? huh??  or if you're suggesting that reduced timber harvests cause bad air and that environmentalists are to blame--you might want to consider that trees are widely known to be primary environmental resources for improving air quality.  they filter particulate matter and pollutants from the air.  they also, by the way, serve as a key resource for global temperature reduction.  too much history and science?