Coby Beck wrote:
Not that I think this is going to happen. This all sprang out of the
twit-du-jour saying that CO2 levels have been as high as 6000ppm in earth's
history so why are we worrying. We may well be heading for ~1000ppm
though...

I understand Coby. I also had a personal interest here living this close
to a really congested road. I was kinda interested if any figures
existed and if anyone had more pointers for me. It's that my houses'
environmental system already has filters for dust but there's not any
consideration for CO/CO2 or SO/SO2 ..

The past few days though have been kinda good .. having a truly bad
Summer with lower than avg temps has also its advantages!:
http://www.lml.rivm.nl/data/histo/445-168.html (text in Dutch though)

Richard