I found this artiucle on Tripadvisor: Austin, Texas: Allergy Capital of the World! Many places in the United States claim the title of "allergy capital" because people in the area suffer significant symptoms. read more
Because it's well-deserved. Austin is in a biome-transition zone between the more arid plains to the west and the wetter hardwood forests to the east. read more
The main reason is due to the temperate climate. Plants in Texas only endure occasional periods of freeze, if any. read more