More colon and breast cancer if live in polluted city Garland 1989
From: http://www.vitamindcouncil.org/cancerColon.shtml 
In 1989, the Garland brothers presented further evidence that vitamin D deficiency played a key role in colon cancer. They analyzed air pollution data from 20 Canadian cities finding that the cities where polluted air obscured vitamin D-producing sunlight had higher death rates from both colon and breast cancer.