November 2012, I mounted one of GASP's (Group Against Smog and Pollution) smoke monitors and rode it 40 miles around metro Pittsburgh. They are still in use, and made an appearance during Open Streets this summer. Here is GASP's story about that. http://alleghenyfront.org/story/turning-bikes-smog-sensing-machines
What I find notable is that the story very nearly quotes the title of this blog, "anything but cars".