Carbon monoxide exposure in the winter was
modestly associated with enteric disease in approximately 25,000 cases
identified (3.8% increase; 95% CI 1.0–6.8 per 1.1 μg/m3 increase in
carbon monoxide) but other pollutants did not reach significance;19
interestingly, no association was found between intestinal disorders and
a number of indices of air pollution in a study in adults.20