Have you heard the point about air fresherners being bad for
your car's system as the chemicals being sucked in by the air
intake is corroding the metal pieces in the car's air con. Have you
ever noticed when the air fresherners spill on any plastic, it
stains and eats into the material. So my point is - imagine
inhaling this smell/chemical into you lungs ???? 
That's why I started using air ionizers instead, both no smell and
good for driver and passengers. Go look into the thread on Neo Tec
air ionizers in this forum on cars. Cheers