Combined synoptic and regional weather patterns affecting atmospheric Poaceae pollen concentrations in Sydney, Australia

Abstract Inhalation of grass pollen can result in acute exacerbation asthma, prompting questions about how reaches metropolitan areas. We establish typical atmospheric Poaceae (grass) concentrations recorded at two samplers within the Sydney basin eastern Australia and analyse their correlation with each other meteorological variables. determine effect synoptic regional airflow on transport during a period extreme (≥ 100 grains m −3 air) concentration characterise meteorology. Finally, we tested hypothesis that most captured by originated from local sources. Fifteen months daily data, three days hourly fifteen meteorology locations were used. Weather Research Forecasting (WRF), Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) modelling conditional bivariate probability functions (CBPF) used to assess transport. Most collected was estimated be sources under low wind speeds. Extreme rare, there no strong evidence support long-distance into or across greater area. Daily average mask sudden increases pollen, which may put significant strain healthcare system. Mapping accurate prediction are first steps an advanced warning system necessary pre-empt resources needed season.