I’m old enough to remember the “smog days” during the late 60’s and early 70’s. The skies where cloudy for days, almost an entire summer one year. Here, in N.J. we have blue skies again, have for several years now. The U.S. has done a great job in cleaning up, not only the air, but streams, rivers and lakes. We are not yet pollution free, but have made much more progress than most other countries. Other countries such as China, India, Russia, many African ones, and some South American countries have a long way to go.
You are soo-o-o-o correct. Thank you! I and your other readers appreciate what you have provided!