out door smell

I grow in 2 2*2*2 tents expeling outside. at the end of the exhaust there is no smell exept omi block. But out side the out building is smells. the exhaust does not excede the intake. both tents are sucking inwards. all cable and air holes in tents closed.
both new filters
Or how to stop it
Any ideas ?

try hooking the outake up to a carbon filter, or maybe just hang some of those cheap car smelly things in ur tents maybe lol.