The ambient pollen distribution in Beijing urban area and its relationship with consumption of outpatient anti-allergic prescriptions.

OBJECTIVE The impact of pollen exposure on allergy medication is poorly characterized. We aim to study the main kind of ambient pollen in Beijing urban area and the correlation with outpatient anti-allergic prescriptions throughout one year in a tertiary hospital. MATERIALS AND METHODS With a modified volumetric trap, ambient pollens were sampled from January to December 2015. Meanwhile, information on 15 anti-allergic medication prescriptions in outpatient pharmacy was obtained and analyzed by generalized linear model. RESULTS The total quantity of pollens amounted to 76164 grains in 2015. Two peaks of pollen concentration were observed, which happened from March to April 2015, and from August to September 2015. Consumption of antihistamines, LATRA, nasal sprays, and SABA showed two peaks trend in accordance with pollen distribution (p<0.01). ICS+LABA showed no seasonal peak without a significant correlation with pollen counts (p>0.05). Medication peak was higher in autumn than spring (p<0.01). CONCLUSIONS The ambient pollen distribution was in accordance with the anti-allergic prescription amount with the two-peak season. The autumn medication peak was higher than spring peak, which clarified that outpatients were more sensitive to autumn pollen compared with spring pollen.