Fig. 1From: Costs and benefits of agricultural ammonia emission abatement options for compliance with European air quality regulationsMean annual PM2.5 surface concentrations (μg/m3) from the control (WCcntr) simulation (left) and difference in PM2.5 concentrations (μg/m3) between the WCcntr and the NH3 emission reduction (WCNH3) simulation (right)Back to article page