common

1. Cigarette smoke
2. Aerosal spray
3. Perfumes
4. Strong odour of almost all type say new or old clothes or old packed
books
5. Room freshners
6. Pungent cleaning agents
7. Diesel,petrol,smoke or kerosene fumes
8. Cold food,it is the most important of the factors.
9. Cold drinks
10. Dhoop, agarbatti ,candle,smoke
11. Antimosquito smokes except ones those are electrically operated.
12. Kitchen odour.