There is a need for information on pollen exposure to assess allergy risk. Monitoring of aeroallergens in a city is usually limited to the use of a single trap for the whole area. While a single trap provides enough information on background pollen concentration for the area, varying pollen exposure across different urban environments, however, is not considered. In this study, we analysed aerobiological data of three pollen seasons (2017–2020) recorded with a volumetric pollen trap in Sydney, Australia. In order to assess spatial differences in pollen exposure across the city, we installed ten gravimetric traps recording pollen deposition for eight weeks during the summer of 2019/2020. We considered the influence of meteorological variables, land use, urbanisation and distance to the sea. Our results showed differences in pollen season characteristics across the three analysed seasons and correlations with meteorological parameters. Considering all years, we found for Poaceae and Alternaria the strongest positive correlation with mean temperature and for Myrtaceae and Cupressaceae with maximum temperature. Likewise, there were negative correlations with humidity (Myrtaceae, Cupressaceae, Alternaria) and precipitation (Myrtaceae, Cupressaceae). Days with medically relevant pollen and spore concentrations varied between years and we recorded the highest amount in 2017/2018 for Poaceae and Alternaria and in 2019/2020 for Myrtaceae. In addition, we found spatial and temporal variations of pollen deposition. However, we did not detect significant correlations between pollen deposition and land use, which can be attributable to drought conditions prior to the sampling campaign and the temporal setting in the pollen season. This study highlights the importance of continuous volumetric aerobiological monitoring as well as the assessment of pollen exposure at several locations across a large urban area.

需要有关花粉暴露的信息来评估过敏风险。城市中空气过敏原的监测通常仅限于在整个区域使用单个陷阱。虽然单个陷阱提供了有关该地区背景花粉浓度的足够信息，但没有考虑不同城市环境中不同的花粉暴露情况。在这项研究中，我们分析了澳大利亚悉尼用体积花粉捕捉器记录的三个花粉季节（2017-2020）的空气生物学数据。为了评估全市花粉暴露的空间差异，我们安装了 10 个重力捕捉器，在 2019/2020 年夏季记录了八周的花粉沉积情况。我们考虑了气象变量、土地利用、城市化和距海距离的影响。我们的结果显示了三个分析季节的花粉季节特征的差异以及与气象参数的相关性。考虑到所有年份，我们发现禾本科和链格孢属与平均温度的正相关性最强，而桃金娘科和柏科与最高温度的正相关性最强。同样，与湿度（桃金娘科、柏科、链格孢属）和降水量（桃金娘科、柏科）呈负相关。医学上相关的花粉和孢子浓度的天数因年份而异，我们记录到的禾本科和链格孢属的含量最高是在 2017/2018 年，桃金娘科的含量最高是在 2019/2020 年。此外，我们发现花粉沉积的空间和时间变化。然而，我们没有发现花粉沉积和土地利用之间存在显着相关性，这可能归因于采样活动之前的干旱条件和花粉季节的时间背景。这项研究强调了连续体积空气生物学监测以及对大城市地区多个地点的花粉暴露评估的重要性。