Food Fly & Smoke

There is so many food fly in my office even though there is no food / stale food around anywhere. Even though I can kill like 2 or 3 there are still so many of them every where. Sigh. This is really really bad. Not only that, sometimes in a single day, we can smell smoke smell from the AC duct and it is like about half an hour to 45 minutes. Even though we complain last time, there is nothing done or nothing can be done about it. I guess working over here will surely shorten my life.