Officials say efforts to reduce air pollution at the Port of Los Angeles are working.
Authorities said diesel particulate levels dropped 7 percent last year compared to 2012 — an 80 percent reduction since 2005. Nitrogen oxide levels also dipped 7 percent — a 57-percent reduction from 2005 — and sulfur oxides fell 8 percent — down 90 percent in eight years.
Harbor officials credit the use of cleaner-burning trucks at the port and speed restrictions on cargo ships to reduce smog from their engines.
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