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. 2022 Mar 4;211:113030. doi: 10.1016/j.envres.2022.113030

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© 2022 The Authors

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 2 — Time series predicted versus observed reproduction number COVID-19. Fig. 2. The time series of the predicted ( $({\hat{R}}_{t})$ versus the observed reproduction number of COVID-19 (R_t) in the Netherlands show the very good fit of both the combined and environmental model during allergy season in the Netherlands. However, the Combined Model predicts Rt even better. The seasonality effect in March is visible in both model.