Put in a newly painted room saucers with salt. The smell of paint will disappear!
When painted in the house and there's a smell of paint (especially in the bedroom), this may cause headache after sleeping. This can be prevented by placing a bowl with milk / buttermilk in the bedroom. The milk then takes the 'paint air' and the headaches stay away.
Cut an onion open (or more too) before you begin painting. The air then lingers reduced.
Bake a cake turns out to help fine against a bad smell of paint! The delicious scent lingers hours and by that time, the paint is air much less.