Ports have long been known as places with highly polluted air.
Large ships running dirty fuel with next to no emissions controls, plus old diesel trucks, plus port machinery, means huge amounts of pollutants such as NOx, SOx, CO and particulates create terrible air quality.
For Los Angeles, add in the fact that it accepts 40% of US containerized freight, and it's geography tends to capture smog within the LA basin, and you've got a recipe for disaster.
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