Note: Modeled using the base case (a) and MOGAS (b) scenarios.
Approximately 18% of the observed piston-engine landing and takeoff fleet and 30% of the activity-weighted fleet at SMO had aircraft models and engines certified to use MOGAS. When accounting for aircraft that can use MOGAS, the maximum three-month average fell from 90 ng/m3 to 73 ng/m3, a 20% 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 consumption rates.
Figure 18 shows the three-month average modeled concentrations around the SMO 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 also significantly reduced the total area with modeled concentrations greater than 10 ng/m3.
Figure 18
Modeled Three-Month Average Concentrations from November-January at SMO
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