I know how you’re feeling as I am in the same position. We have a beauty salon under us and the smells can be very strong, we have a little girl aged 4 and she chokes on the smell. We have had windows open through the winter so we can breathe making our flat very cold. The have vents but they do nothing. They also use a huge air con system that makes so much noise.
The Salon its self have no care for what we have said and refuse to turn off the air con system
Environmental health turned up and got them to seal part of the ceiling but this has not worked and now EH seem as if they are not interested.
I do not know what to do now and life the other guy on here im starting to get very angry over it all.
Mark