two best things you can do are:

1-know your triggers (allergens, cold air, exercise) and manage them (cold air is new to you and likely to be a trigger so be prepared as per cata1st)

2-take your medicine every day (the steroid in your seretide/advair/etc is critical to keeping you healthy!) if you're well controlled you wont have to worry about a thing!

overall, i find it to be a pretty health climate!