Air Fresheners both sprays and solids are frivolous at best, dangerous at worst. They coat your nasal passages with an oily film that prevents you from smelling things you don’t like, or they simply mask the unwanted odour with a much stronger one. Some use chemicals that actually numb the nerves you use to smell. They also contain a variety of toxic substances that you would inhale along with the fragrance.
A better option would be to start with good ventilation in your bathroom, kitchen, and bedrooms. A dish of potpourri is safe, harmless, lovely and can be bought in bulk rather than in wasteful plastic packaging.Or wrap some cloves and cinnamon stick in cheesecloth and put it in a pot of boiling water, and let it simmer for a while on the stove. A lighted beeswax candle can burn gaseous odours away.
from: The Canadian Green Consumer Guide.