Clean Air Engineering – Maritime operating a Marine Exhaust Treatment System bonnet at the Port of Los Angeles. Photo: Clean Air Engineering. The Port of San Diego revealed in mid-May that it’s moving forward with a system, known as a bonnet, to control and capture cargo vessel emissions. The bonnet will be available for use by cargo vessels that aren’t yet equipped to connect to shore power. In support of the port’s new Maritime Clean Air Strategy (MCAS), San Diego’s Board of Port Commissioners has approved an agreement with Clean Air Engineering – Maritime Inc. (CAEM) to design, build and…