Standardised index for measuring atmospheric grass-pollen emission

Area of Science:

• Allergen research
• Environmental science
• Public health

Background:

• Grass pollen is a major cause of allergic rhinitis in Europe, posing a significant public health risk due to high concentrations and allergenic potential.
• Optimizing the prevention, diagnosis, and immunological treatments for pollen allergies requires understanding which specific grass species contribute most to airborne pollen during high-risk periods.

Purpose of the Study:

• To identify the grass species responsible for triggering allergies during peak pollen seasons.
• To quantify the contribution of individual grass species to overall airborne pollen levels.
• To develop a model for assessing pollen contribution applicable to various regions and allergenic pollens.

Main Methods:

• Analysis of 28 potentially allergenic grass species.
• Development of a Pollen Contribution Index (PCI) incorporating flowering phenology, pollen grain size, species abundance, and pollen production.
• Application of the PCI in a case study within the central Iberian Peninsula (Mediterranean climate).

Main Results:

• The study identified Dactylis glomerata subsp. hispanica, Lolium rigidum, Trisetum paniceum, and Arrhenatherum album as the primary contributors to airborne grass pollen.
• These dominant species share characteristics such as small pollen grain size (enhancing buoyancy), high pollen production, and significant abundance.
• The findings indicate that a limited number of grass species are responsible for the majority of airborne grass pollen.

Conclusions:

• A small subset of grass species significantly dominates airborne pollen, driving allergic reactions.
• The developed Pollen Contribution Index is a valuable tool for assessing the impact of different species on pollen allergy burden.
• This research supports targeted strategies for allergy management, including improved diagnostics and more effective immunotherapy.