Still working on air pollution, I wonder if anyone heard about the carbon
isotopic composition of atmospheric CO2 in urban cities.
I guess that compared to the value you can measure in non-polluted areas,
the values should be lower according to the fact that human made CO2 has a
very negative signature.
Laboratoire de Geochimie des Isotopes Stables
Universite Paris 7-Denis Diderot
4, place Jussieu
75252 Paris Cedex 05
Tel. 44 27 60 88
Fax. 44 27 28 30