A decade ago, seminars in the field pointed out that 2,300 types of pollutants are produced as byproducts of cigarette smoke. In contrast, at a recent seminar Hatfield found that scientists had increased the number of recognized pollutants to 4,000. Hatfield has plenty to keep him busy. The Metro Nashville educational system comprises 128 public schools, occupying 160 buildings. They are used daily by more than 71,000 students and close to 9,000 employees.
Air quality is a constant concern.
Another four percent seem to solve themselves. For that last four percent, we normally call outside environmental engineers in. There are many issues to be sorted. We deal a lot with molds and mildew. Now, a sewer is a horrible smell, but the odor that comes from a grease trap is much worse.