Fig. 3From: Science communication on the public health risks of air pollution: a computational scoping review from 1958 to 2022Distribution of valid topics identified through the structured topic modelling and merged manually over time by number of articles and proportion of articles (1958–2022) with n = 5006 references. Note: The decrease in all topics in 2022 is most likely due to data collection in May 2022Back to article page