L.A.
One of my 5yr old twins has gotten croup at least 4-5 times in the last 2 yrs. The last 2 times I contributed it to chlorine. One time she got it after a trip to the sprinkler park, and the second time we were at a hotel with a pool and she got it. Both times we went to the emergency room. The first time using the nebulizer at home did not help, and the second time we did not have it with us. She has been fine since the last episode last Spring.
Now when we go on any trips, I take the nebulizer with.