The National Allergy Bureau (NAB) is a section of the American Academy of Allergy, Asthma and Immunology's (AAAAI) Aeroallergen Network. The Aeroallergen Network is a system of pollen and spore counting stations staffed by AAAAI member volunteers who donate their time and expertise. The NAB currently provides pollen and mold counts from over 75 counting stations throughout North America.