Mosquito-Borne Disease Prevention Tips

One thing I have noticed living in a country where we are constantly bombarded with mosquitoes is that mosquito are less frequently seen in heights. By height I don't mean the height from the sea level. It's the height in a certain area. For example,my ward is in the 3rd floor and my room is in the ground floor. I get bitten by less mosquitoes when I'm in the ward than when I'm in my room. My girlfriend who stays in the 6th floor has no mosquito problem at all! I do't know ho...