UVC products implemented in some industries are the perfect solution due to being chemical free, others due to the low cost or labor free. Air can be sanitized 24/7/365 for a very minimal cost as long as 5 years with addition of an induction bulb in an environment. In almost all industries, the easiest first step is taking care of the indoor air. 

In each industry, best practices and the easiest solutions are the first steps. Once proven at that particular site, other more advanced or expensive units could be added.