Heyes, AnthonyRivers, NicholasSchaufele, Brandon2020-04-152020-04-152016http://hdl.handle.net/10393/40374https://doi.org/10.20381/ruor-24607Applying methods of textual and stylometric analysis to all 119,225 speeches made in the Canadian House of Commons between 2006 and 2011, we establish that air pollution reduces the speech quality of Canadian Members of Parliament (MPs). Exposure to fine particulate matter concentrations exceeding 15μg=m3 causes a 3.1 percent reduction in the quality of MPs speech (equivalent to a 3.6 months of education). For more difficult communication tasks the decrement in quality is equivalent to the loss of 6.5 months of schooling. Our design accounts for the potential endogeneity of exposure and controls for many potential confounders including individual fixed effects. Politicians are professional communicators and as such the analysis provides further evidence of the detrimental impact of air pollution on workplace performance, with an effect size around half that established in recent research for workers engaged in physical work tasks. Insofar as the changed speech patterns reflect diminished mental acuity the results make plausible substantial effects of air pollution on productivity not just in communication-intensive but a wider set of creative and cognitively-intensive work settings.enair pollutionanalysis of speechnon-health impactsworkplace performanceWorking Paper