The results laid much of the blame on ammonia fertilizers, long known to cause air pollution and health problems. When Hill’s team compared the life cycle assessment models, they noted that the geographic distribution of corn production lined up with the geographic distribution of ammonia-related fine particulate matter and air pollution-related deaths, according to the Popular Science report. Based on this localized data, they estimated that air pollution generated by corn production contributed to 4,300 deaths. [Source]
Real organic farming doesn't contribute to this at all. To boost organic farming, buy only organically grown and processed foods.