Fig. 4From: Exploring associations between multipollutant day types and asthma morbidity: epidemiologic applications of self-organizing map ambient air quality classificationsRate ratios of emergency department visits for pediatric asthma on day following occurrence (i.e., lag 1) of each SOM-based multipollutant day type as compared to the referent group [1, 1] in Atlanta, Georgia from 1999 to 2008Back to article page