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. 2020 Dec 30;329:251–259. doi: 10.1016/j.ijcard.2020.12.059

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Fig. 3 — Association between mean daily nitric dioxide (NO2) concentration and risk of ST-elevation myocardial infarction (STEMI) undergoing percutaneous coronary intervention (PCI): black dots show the first 3 months of 2019, and blue dots the first 3 months of 2020, and dot size represents the number of same day coronavirus disease 2019 (COVID-19) tests; the smooth line was computed using a generalized additive model. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)