Southern California air quality officials will craft rules governing warehouse, rail yard pollution

Southern California air quality officials voted Friday to craft rules governing warehouses, distribution centers and rail yards in a controversial bid to combat transportation emissions in the nation's smoggiest region.

The governing board of the South Coast Air Quality Management District moved to begin devising rules to regulate freight facilities as "indirect sources" of pollution because of the truck and locomotive traffic they attract.

The approach targets cargo-moving industries that are the lifeblood of the Southern California economy but responsible for much of the most harmful, smog-forming emissions.

Diesel trucks are the greatest obstacle to clean air in the region. Though regulation has helped rein in emissions from passenger cars, truck pollution controls lag behind.

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