Clean-air plan for San Joaquin Valley first to meet all federal standards for fine particle pollution

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January 24, 2019

Release #19-04


Clean-air plan for San Joaquin Valley first to meet all federal standards for fine particle pollution

Integrated approach provides range of actions to reduce PM2.5 emissions

SACRAMENTO – The California Air Resources Board today adopted a plan that demonstrates to the U.S. Environmental Protection Agency how the San Joaquin Valley air basin will attain each of four federal standards for fine particulate matter by regulatory deadlines.

Meeting standards for fine particle pollution, or PM2.5, is the San Joaquin Valley’s most critical air quality challenge. The San Joaquin Valley has the worst particulate matter pollution in California — and the worst in the nation for annual federal standards. The newly adopted 2018 Valley PM2.5 Plan is expected to result in significant improvement in air quality by 2024.

The plan was shaped by an extensive public process, including 10 public meetings on the draft strategy. The plan’s development involved close collaboration between CARB and the San Joaquin Valley Air Pollution Control District.

The result is a balanced strategy with air pollution controls on important mobile, stationary and area-wide sources that will achieve the needed reductions of PM2.5 and nitrogen oxides (NOx) emissions to reach attainment. NOx, produced in the air during combustion, is an important precursor for fine particle pollution.

“This plan is the result of a cooperative effort among air quality regulators at the local and state level, members of the community, and industry,” CARB Executive Officer Richard Corey said. “It provides a range of actions to clean the air and protect the health of everyone who lives or works in the San Joaquin Valley. Now begins the hard work: to implement the measures and secure funding for the incentives to make sure the plan delivers the required air pollution reductions.”

Particulate matter, which can be made up of soot, soil, dust and sulfate particles, comes from a variety of sources, but primarily from the burning of carbon-based fuels, such as gasoline, diesel and wood. In the San Joaquin Valley, car and truck emissions make up about half of measured airborne PM2.5, and local sources, such as wood smoke and dust, make up the other half.

Numerous scientific studies have linked exposure to airborne PM2.5 to increased severity of asthma attacks, development of chronic bronchitis, decreased lung function in children, respiratory and cardiovascular hospitalizations and even premature death in people with existing heart or lung disease. PM2.5 exposure is responsible for about 1,200 cases of premature death in the Valley each year.

Despite progress — existing CARB strategies such as engine and fuels standards have reduced Valley NOx emissions by 60 percent and Valley Air District programs have reduced PM2.5 emissions by nearly 40 percent — PM2.5 emissions are expected to rise as the population grows.

The plan approved today sets forth a strategy for meeting all four national standards. Currently, the Valley is designated nonattainment for the following federal health-based standards for PM2.5: the 1997 24-hour (65 micrograms per cubic meter) and annual (15 ug/m3) standards, and the 2006 24-hour (35 ug/m3) and 2012 annual (12 ug/m3) standards. Deadlines for attaining these standards are 2020, 2024 and 2025, respectively. (The 2020 deadline is for both 1997 standards.)

Benefits from the plan are expected to be significant. For example, the city of Fresno is predicted to see a 40 percent improvement in air quality between 2013 (the base year of the plan) and 2024, when the Valley is expected to attain the 35 ug/m3 standard). The Valley Air District has committed to an aggregate reduction of 1.3 tons per day of directly emitted PM2.5 emissions and 1.9 tons per day of NOx emissions in 2024.

The plan relies on both regulations and financial incentives to accelerate emissions reductions. Securing approximately $5 billion in incentive funding by 2024 will be critical for implementing the plan. CARB is committed to working with the air district and stakeholders to help secure a steady stream of needed funding.

Measures for reducing emissions include:

  • New regulations targeting emissions from heavy-duty trucks, including an inspection and maintenance program, a low-NOx engine standard and a low-emission diesel fuel requirement
  • Tightened controls on residential wood-burning stoves and fireplaces, and enhanced incentives for cleaner-burning alternatives
  • Enhanced incentives for purchase of cleaner agricultural equipment and commercial underfired charbroilers
  • A suite of measures to reduce emissions of NOx from flares, including flares at refineries, oil fields and landfills, internal combustion engines and boilers, among other sources.

Taken together, reductions from CARB and air district measures, implemented for the 2018 PM2.5 Plan, will provide significant air quality benefits.

More Information

PM2.5 reductions from CARB and Valley Air District control measures


Melanie Turner
Office of Communications
(916) 322-2990