National Allergy Bureau 
Daily pollen/spore counts for US cities, including source-specific counts and alerts by email.
http://www.aaaai.org/nab/Personal Allergy Forecast
Pollen.com's Personal Allergy Alert Forecast provides vast amounts of information on pollen and allergies for sufferers. Get a daily allergy forecast emailed to you.
http://www.pollen.com/
Air Quality Forecasts- USA
Ozone, Wildfire, Air Stagnation
http://www.arl.noaa.gov/ready/aq.html
Air Pollution
Air Pollution links from About.com
http://weather.about.com/cs/acidrain/index.htm
