New Orleans is one of the hardest places to live in the U.S. if you have pollen allergies, according to a report from the Asthma and Allergy Foundation of America. The city was ranked No. 18 on the list of 100 metro areas this year, down from No. 2 in the previous year due to a shorter weed pollen season. Other common offenders are live oaks, pine, pecan, tallow, sycamore, elm and cedar trees. Antihistamines like Claritin, Allegra and Zyrtec can offer relief without the drowsiness associated with older antihistamines.