I came across the Google Crisis Map today and found it to be excellent. I really like the use of real-time data to give you great graphical insights into weather patterns. I look forward to seeing where they take it next. You can turn on all kinds of different layers too.
Check out the weather layer along with traffic alerts using the company waze.com they purchased
Here is air quality in California. It is Saturday when I created this so air quality should be good as it is shown.
Browse on over and check it out. It is worth the play time.