Fig. 1

A1 – A3 Posterior mean estimates of duration where the highest MIDAS weights were placed on the importance of respective ambient air pollutant measurements for each province on influencing URTI disease case counts the following month. Darker red and blue shaded regions represent that ambient air pollutant measurements beyond 20 – 40 days are deemed more important in determining URTI disease case counts. B1 – B3 2.5^th quantile value for MIDAS weights drawn from MCMC samples C1 – C3 97.5^th quantile value for MIDAS weights drawn from MCMC samples