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Puget Sound Maritime
Air Emissions Inventory

2016 Inventory Results

A recent report compiled by the Puget Sound Maritime Air Forum partners, a voluntary association of seven ports, including the Port of Seattle, six government agencies, and three industrial partners, shows:

  • Maritime-related air pollutant emissions decreased in nearly every sector between 2005 and 2016.
  • Air pollutant emissions decreased by up to 97 percent, depending on the type.
  • A 69 percent decreas for fine particles, which are harmful to human health.

The first inventory was conducted in 2005 with updates performed every five years (2011 and 2016) to track emission reductions over time and ensure that emission estimates remain current. It estimated emissions of greenhouse gases, diesel particulate matter, sulfur dioxide and a number of other pollutants, such as volatile organic compounds.

The inventory focuses on pollutants related to ships, harbor vessels, cargo-handling equipment, rail, heavy-duty trucks and other fleet vehicles associated with maritime activity operating in the greater Puget Sound region.

Emission Changes 2005 - 2016

2005 - 2016 Inventory Graph

2011 Inventory Results

Maritime-related air pollution in the Puget Sound region has decreased – as much as 40 percent, depending on the type – since 2005. The Port of Seattle’s air emissions of various pollutants decreased by five to thirty-eight percent, depending on the pollutant. Find the full report here 

Much of the progress in reducing emissions is due to significant voluntary investments in cleaner technology, cleaner fuels and more efficient methods of operation. The Northwest Ports Clean Air Strategy along with mandatory engine and fuel standards are helping to further reduce emissions in the Puget Sound airshed.

Results from the 2011 EI will help guide and focus future emissions reduction efforts.