Abstract From clinical point of view, knowledge of the pollen season and loads in the atmosphere of every community is important so as to guide on incidence and management of pollinosis. The aim of this work therefore is to evaluate the weekly constituents of the atmospheric pollen and fern spores of two communities in Lagos Nigeria and the relationship, if any, between the weekly aeroflora and hospital reported pollinosis cases. As part of efforts to contribute to the gathering of aerobiological data in Lagos State, a weekly gravimetric sampling of two locations (Ipaja and Ogba) in Lagos, Nigeria were undertaken from January 2018–December 2018 and the reported pollinosis cases (asthma and rhinitis) were collected from the surrounding hospitals. The samplers were placed on rigid platforms at 2?m above the ground level, the harvested residues were subjected to standard palynological procedure and twenty microlitres of each sample were studied microscopically. A total of 30 pollen taxa were identified with Amaranthaceae (544) dominating the palynomorphs at Ipaja and Elaeis guineensis (347) at Ogba. Using correlation (r?=?0.1, p-value?=?0.55 at Ipaja while r?=?0.3, p-value?=?0.33 at Ogba) and RDA test at p?>?0.05, there is insignificant positive relationship between pollinosis cases and abundance of palynomorphs. However, at Ipaja, RDA indicated Poaceae and Elaeis guineensis as the possible drivers for asthma cases while Amaranthaceae and fungal spores were identified as weak drivers for catarrh. At Ogba, the loess curve and correlation test showed a significant positive relationship at p?
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