MIRA LOMA, Calif.—A proposed mega-warehouse project in Riverside County will move forward, but project developers will have to monitor for pollution as part of a settlement Thursday with the state of California and environmentalists.

"It is a false choice to suggest that in order for California business to thrive, public health must suffer," state Attorney General Kamala Harris said in a statement announcing the deal.

The Center for Community Action and Environmental Justice filed a lawsuit in 2011 on behalf of residents against the industrial development, saying officials failed to adequately take into account the impact on residents' health. The group feared it would lead to increased traffic and noise pollution from diesel-belching trucks. Kamala's office later joined the action.

Under the deal, project developers and the city of Jurupa Valley agreed to install air filtration systems in residents' homes, monitor air quality in the region and provide landscaping to reduce exposure to diesel emissions.

For a decade, residents had opposed the proposed Mira Loma Commerce Center, which called for 1.4 million square feet of warehouses and industrial buildings on 60 acres of land. It would bring an estimated 1,500 extra truck trips past the low-income, primarily Hispanic neighborhood, which already endures some of the worst diesel pollution in the nation with some 15,000 truck passings every day.

The region is home to about 90 mega-warehouse complexes that officials have approved since the 1990s.


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They draw thousands of trucks shuttling to and from the ports of Los Angeles and Long Beach.