Note: Modeled using the base case (a) and MOGAS (b) scenarios.
About 27% of the observed piston-engine landing and takeoff fleet and 35% of the activity-weighted fleet at PAO had aircraft models and engines certified to use MOGAS. When accounting for aircraft that can use MOGAS, the maximum three-month average fell from 121 ng/m3 to 84 ng/m3, a 30% reduction.
Again, the total reduction was less than the fraction of aircraft because the aircraft certified to use MOGAS tended to have lower overall fuel burn rates. Figure 19 shows the three-month average modeled concentrations around the PAO airport for the November–January averaging period (the period with the highest modeled three-month average concentration) for (a) the base-case scenario; and (b) the scenario using MOGAS. In addition to reducing the maximum hotspot concentration, the replacement of AVGAS with MOGAS substantially reduced the total area with modeled concentrations greater than 10 ng/m3 and reduced the impacts that extend beyond the airport boundary.
Figure 19
Modeled Three-Month Average Concentrations from November-January at PAO
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