Figure 5. Sampling results and modeled deposition for creeping bentgrass pollen on 25 June 2005. (A) Pollen concentrations measured by rotary impaction samplers in the sampling array depicted in Fig. 1. Background pollen concentrations, measured upwind of the plot, have been subtracted. (B) CALPUFF-simulated dry deposition of pollen grains from a 2.4-ha field of creeping bentgrass, using the diurnal pattern of pollen emission rates and the weather conditions that occurred on 25 June 2005. Isopleth units are the number of viable pollen grains deposited per m² of surface area during 24 h (2400–2400 h). (C) CALPUFF-simulated dry deposition from a 25-ha field on the same date.