I also have an asthma that is super sensitive to hairsprays, scents and mens aftershaves, a small amount doesn't worry me to much but some put a ridiculous amount on and just makes me feel like i am going to be sick, cuts my breath and blocks my sinuses straight away.
City pollution is another, since moving out of the city 7 years ago it has made a huge difference to my sinuses and asthma , never related it to PN either, but i can easily see how they really could affect some, though.
Brian