In an Irish context, and indeed in Northern Europe, one of the most important allergenic pollen types is birch (Betula spp.). Thus, forecasts of such atmospheric pollen are important tools for helping patients suffering from allergenic rhinitis and/or atopic asthma to avoid high ambient concentrations and manage their symptoms. This work aims to improve knowledge about the spatial and temporal variations in the distribution of birch trees and airborne Betula pollen in Ireland, which is an important step towards producing such forecasts. The footprint of airborne Betula pollen recorded in Ireland was determined by using HYSPLIT backward Lagrangian dispersion modelling methodology and mapped using Geographic Information System (GIS) software during the Main Pollen Season (MPS) and for days with airborne concentrations > 80 pollen grains/m³ in Dublin and Carlow (72 km apart) for 2018 and 2019. An inventory of birch trees within broadleaved forests was constructed using statistical data from different vegetation inventories for Ireland with a resolution of 100 m x 100 m. Historical datasets of airborne Betula pollen recorded in Dublin during 1978-1980 and 2010-2011 were also related to changes in land cover and climatic conditions over the same period. Dispersion modelling showed that air masses arriving in Ireland on days with Betula pollen concentrations >80 pollen grains/m³ resided for a longer time over Great Britain. The birch tree inventory for Ireland will enhance the performance of forecast models. Airborne Betula pollen concentrations in Ireland have increased over the last 40 years, which is related to concomitant increases in the fraction of birch trees in forest areas as well as the ornamental use of birch trees in urban areas and their reaching maturity. Climate change did not seem to influence birch pollination.

在爱尔兰乃至北欧，最重要的致敏花粉类型之一是桦木（桦木属）。因此，预测这种大气花粉是帮助患有变应性鼻炎和/或特应性哮喘的患者避免高环境浓度和控制其症状的重要工具。这项工作旨在增进人们对爱尔兰桦树和气生桦木花粉分布的时空变化的认识，这是做出此类预测的重要一步。空中桦树的足迹爱尔兰记录的花粉是使用HYSPLIT向后拉格朗日色散建模方法确定的，并在主要花粉季节（MPS）期间以及都柏林和卡洛（Carlow ）的空气中浓度> 80花粉颗粒/ m ^3的日子中，使用地理信息系统（GIS）进行制图（距离分别为72公里），用于2018年和2019年。使用来自爱尔兰不同植被清单的统计数据，以100 mx 100 m的分辨率构建阔叶林中的桦树清单。1978年至1980年和2010年至2011年在都柏林记录的机载桦花粉的历史数据集也与同期的土地覆盖和气候条件的变化有关。弥散模型显示，气团在数天之内与Betula一起到达爱尔兰花粉浓度> 80花粉粒/ m ³在英国居留较长时间。爱尔兰的桦树库存将提高预测模型的性能。空降桦爱尔兰花粉的浓度已经在过去40年增加了，这是在白桦树的森林地区，以及在市区观赏用白桦树和他们日渐成熟的分数与伴随增加。气候变化似乎并未影响桦树授粉。