Harvesting and trimming will release a LOT of odors. I grow in a tent and use carbon scrubbers to eliminate odor, however when trimming, I place ozone generators near my bedroom door and in the bedrooms close to mine and it is virtually unnoticeable after a few minutes. The ozone generators came from eBay and were about $70 each. They KILL marijuana smell, no trace! I've also read that if you place one in a grow room or tent, it will kill the smells in the buds as well, which most of us do not want.