Here in the UK, anyone can purchase sets of data from the Office for National Statistics which give the numbers of live births and the deaths at different ages for all electoral wards - ie the UK equivalent of US census tracts.

When I looked at the infant mortality rates subject to industrial PM2.5 emissions from incinerators, oil refineries, power stations, foundries etc. I found wards with very high infant death rates.

Electoral wards which are free from such emissions have very low infant death rates and sometimes zero infant deaths for the entire published fifteen year record of data, 1993 to 2007.

Black's Medical Dictionary for 1944 reveals that infant death rates are lowest in agricultural districts which suggests that those districts will have less exposure to the products of combustion which will be found in large towns and around power stations, steelworks, etc.

Dawn Shanafelt, of Saginaw County Public Health Department, is mapping infant death rates by US census tract as reported in Saginaw News, 27 April 2009.

Kind regards,
Michael Ryan BSc, C Eng, MICE
Shrewsbury,
UK