Asthma aggravators?

For those with asthmatic cats, are there any specific triggers or things that tend ro make the condition worse? My cat has some issues and I was wondering if anything I'm giving her or exposing her to, may be exacerbating her problems.
I don't know much about asthma in cats but I know that in humans, there are certain things that affect the condition.

Here are some resources:

http://www.fritzthebrave.com/

https://beta.groups.yahoo.com/neo/groups/felineasthma/info

http://www.felineasthma.org/

Dust and other household allergens can trigger asthma in cats. Secondhand smoke of any kind can also trigger it. I think dry air can trigger an attack, too. You can use a Hepa air filter (whole house type or a small room unit)  in your home to keep allergens to a minimum.