Figure 6:

Monthly average daily SABA use before and after the June 2016 Mill Creek SO₂ scrubber installation. Orange represents the period prior to the scrubber installation and navy blue after. Points are monthly average daily predicted SABA use from the adjusted model. Relative risks (RR) from a conditional Poisson case interrupted time-series model, which should be interpreted within-individual. Model was adjusted for temperature, humidity, windspeed, ambient pollen (grass, tree, and weed), mold counts, and long-term and seasonal trends. Lagged residuals were used to account for autocorrelation.