Senate Resolution 561 - Brief
Contributors: Eva Frazier, Ryan Kemp, Adrian Villaneda
What is Senate Resolution 561?
S. RES. 561, titled “Recognizing that particulate matter pollution can cause heart attacks, asthma, strokes, and premature death,” is a Senate resolution that recognizes that there are health risks associated with exposure to particulate matter pollution. Unlike a bill that creates a new federal program or changes existing law, resolutions, including S. RES. 56, solely express the Senate's position. The resolution recognizes that exposure to particulate matter is associated with serious health effects, including heart attacks, asthma, strokes, decreased lung function, bronchitis, lung cancer, and premature death. Particulate matter, commonly referred to as PM, consists of very small particles that can be inhaled into the respiratory system.
S. RES 561 was introduced by Rhode Island Senator Sheldon Whitehouse and referred to the Committee on Environment and Public Works. Its primary purpose is to formally recognize the health risks associated with particulate matter and encourage continued attention to reducing exposure. If passed, it would solidify the Senate’s official position regarding PM and register the body’s belief that the Environmental Protection Agency must regulate this form of pollution.
Why was it introduced ?
Sponsoring Senators of S. RES. 561 argued that the resolution, and 15 others, would “formally acknowledge the widespread harms from climate change and toxic air pollution" amidst a period of proposals to loosen environmental standards. The Environmental Protection Agency identifies particulate matter as a pollutant that can cause serious health effects, particularly for children, older adults, and people with existing heart or lung conditions. These smaller particles can lodge themselves deep within a person’s lungs, and, in some cases, the bloodstream. According to air quality monitors, General particulate matter is noted as PM 2.5, and fine particulate matter is classified as PM 10. Fine particulate matter is especially concerning because of its small size and ability to penetrate deep into the respiratory system.
S. RES. 561 has a limited but potentially important policy role because it does not directly regulate particulate matter. Its immediate effect is to establish the Senate's position that particulate matter presents significant health risks and that protecting the public from exposure is an important policy concern. As a resolution, S. RES. 561 does not have a formal list of opponents. However, while S. RES. 561 only formally establishes the body’s belief that P.M poses health risks, at the end of the resolution, it directs the Environment Protection Agency to set a national standard for PM regulation. In the past several industries, including the steel industry and the oil industry, have opposed EPA regulation of particulate matter. In June of 2026, the Steel Manufacturers Association publicly denounced the EPA’s decision to lower the permitted PM2.5 standard, citing concerns that reducing the amount of allowed emissions would hamstring domestic manufacturing. The National Association of Manufacturers, the American Petroleum Institute and other commerce related associations have similarly opposed such regulations.
How is this relevant for the Inland Empire ?
For the Inland Empire, the resolution is relevant because of the region's air quality challenges and its role as a major transportation and logistics center. The resolution alone would not reduce emissions from warehouses, trucks, or other sources. However, it could contribute to broader federal discussions about air quality and provide support for future policies addressing particulate matter.
Riverside and San Bernardino Counties have experienced significant air quality challenges associated with transportation, freight movement, industrial activity, and other sources of air pollution. In 2026, the American Lung Association ranked San Bernardino County and Riverside County, respectively, "first and second nationally for smog pollution". Smog pollution is made up of both PM 2.5 and PM 10, and in the Inland Empire, the region’s major logistics and warehouse facilities contribute to substantial truck traffic. Heavy duty vehicles, like commercial trucks, are only a small percentage of global transport, but contribute extensively to particulate pollution due to their fuel burning practices. These transportation patterns are one factor contributing to particulate matter and other air pollutants in the region; the freight sector is now known to be the source of more than 70% of Southern California’s “ambient inhalation cancer risk,” through its emissions of PM in diesel fuel. Environmental advocates within the Inland Empire have criticized Federal agencies' past reluctance to implement regulations on transport emissions, like “Advanced Clean Fleets and In-use Locomotive Rule,” which requires local and state agencies to replace their vehicle fleet with Zero-Emission Vehicles when purchasing new vehicles. S. RES. 561 itself would not change these conditions within the Inland Empire because it does not regulate emissions. Instead, its significance is that it formally recognizes the health consequences of particulate matter at the federal level. Any direct changes to emissions would have to come through separate legislation, regulations, or actions by federal, state, or local agencies.
Who are the decision makers?
Currently, the resolution has been referred to the Committee on Environment and Public Works. S. RES. 561 is a simple resolution, which requires only the ratification of the body that proposed it, in this case, the US Senate. To pass the resolution, the Senators within the Committee on Environment and Public Works must debate the resolution, make any necessary amendments, and then vote to send the resolution to the full senate floor. From there, the resolution would be scheduled for debate, and then voted upon by the entire senate. If the resolution is not passed by the Senate at the 2025-2027 congressional period – January 2027 – the resolution will “die,” or no longer be up for active consideration.
As a result, for the resolution to move out of the committee and receive any further consideration, the Senators on the Committee would have to take action to bring the resolution to the larger Senate. The committee includes both of your California Senators, Senator Padilla and Senator Schiff and 17 other Senators.
If S. RES. 561 is passed, Federal, state, and local government agencies are also relevant decision makers because they are responsible for developing and enforcing air quality standards. The resolution could contribute to broader policy discussions about particulate matter, but any new regulatory requirements would come through separate government action.
Bibliography
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