Grass pollen counts, air pollution levels and allergic rhinitis severity

Area of Science:

• Environmental Health
• Allergology
• Epidemiology

Background:

• The interplay between airborne pollen, air pollutants, and allergic rhinitis severity is not well understood.
• Seasonal allergic rhinitis (SAR) affects a significant portion of the population, impacting quality of life.

Purpose of the Study:

• To investigate the relationship between pollen levels, air pollution, and the risk of severe SAR.
• To model SAR severity based on pollen counts and environmental factors in a large patient cohort.

Main Methods:

• A nationwide sample of 36,397 patients with physician-diagnosed SAR was analyzed.
• Symptom severity was quantified using the Symptomatic Global Score (SGS), with the upper quartile defined as severe SAR.
• A multilevel model was employed to analyze SAR severity in relation to pollen and air pollution data.

Main Results:

• Among 17,567 urban patients, 18.9% experienced severe SAR.
• An increase of 60 grass pollen grains/m³ was associated with an 8% higher risk of severe SAR.
• These findings were consistent in patients with confirmed grass pollen sensitization.

Conclusions:

• Elevated grass pollen levels are a significant factor exacerbating SAR symptoms.
• The study underscores the importance of tailored treatment and preventive measures for SAR patients sensitive to grass pollen.