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Pollution Sources

Find the largest pollution sources in LB-LA Harbor by clicking the points on the map.

Pollution Source Maps

The maps pinpoint LB-LA Harbor’s largest sources of Carbon Monoxide, Nitrogen Dioxide, Ozone, and Particulate Matter pollution, which are documented to exacerbate asthma by the California Air Resources Board. The Harbor Community Benefit Foundation reports the area has high levels of emissions from stationary and mobile sources of pollution, along with a wide variety of other environmental hazards, and face elevated health risks as a consequence. Pollution sources are categorized according to the South Coast Air Quality Management District.

Ports of Los Angeles (POLA) and Long Beach (POLB)

Point to find the LB-LA Harbor communities exposed to pollution from ocean-going vessels, harbor craft, cargo handling equipment, locomotives, and heavy-duty vehicles.

Stationary Sources

Point to find the refineries, oil and gas production facilities, electricity generation, cogeneration, and hydrogen plants in LB-LA Harbor.

Stationary Sources Data Methodology

Asthma Danger Levels measured the pollution levels of each stationary source as reported by the California Air Resources Board. The fenceline is 1.5 miles for refineries and 0.5 miles for non-refineries.


California Air Resources Board, “Pollution Mapping Tool Sources in Your Community” 2018.

South Coast Air Quality Management District, Rule 1180 – Refinery Community and Fenceline Air Monitoring.

Truck Highway Traffic

Point to find the truck highway traffic corridors in LB-LA Harbor.  


Point to find the pollution hotspots identified by LB-LA Harbor community members.

Community-Identified Data Methodology

Pollution hotspots are identified by the Long Beach Alliance for Children with Asthma with a coalition of LB-LA Harbor community organizations. Asthma Danger Levels measured each hotspot’s census tract asthma and pollution levels as reported by the CalEnviroScreen. The fenceline is 0.5 miles.


Long Beach Alliance for Children with Asthma, November 2020, January 2021.

South Coast Air Quality Management District, “AB617 Community Steering Committee Truck Idling Map”, 2018.

Transportation Research Record, “Diesel Truck Idling Emissions”, 2007.