article thumbnail

EPA proposes retaining current NAAQS for particulate matter

Green Car Congress

The current annual standard has been in place since 2012. concentrations in the US fell by 39% between 2000 and 2018 while average PM 10 concentrations fell by 31% during the same period. The annual fine particle standard is designed to protect against health effects associated with both long- and short- term exposure to PM 2.5.

EPA 186
article thumbnail

California 2017 GHG inventory shows 1.2% total drop from 2016; transportation sector emissions up 1%

Green Car Congress

Changes in emissions by Scoping Plan sector between 2000 and 2017. The percent of biodiesel and renewable diesel in the total diesel blend have shown a significant growth in recent years, going from 1% in 2012 to 18% in 2017. Compared to 2016, California’s GDP grew 3.6% while the carbon intensity of its economy declined by 4.5%.

2017 230
article thumbnail

Study projects net cooling of climate from ship emissions through 2050

Green Car Congress

In addition to CO 2 , other compounds such as ozone (O 3 ) precursors (nitrogen oxides (NO x =NO+NO 2 ), carbon monoxide (CO), and volatile organic compounds (VOCs)) and aerosols such as black carbon (BC) and organic carbon (OC) are emitted by ships. 1 from shipping in 2007, corresponding to 3.3% 1 of the total ship emissions in 2007.

Climate 240
article thumbnail

Critical review finds actual measurement data on segments of natural gas lifecycle sparse or lacking

Green Car Congress

Between 2000 and 2011, the number of producing gas wells in the US increased by 50%, reaching 514,637. Air emissions from the natural gas life cycle include greenhouse gases, ozone precursors (volatile organic compounds and nitrogen oxides), air toxics, and particulates. well production end-of-life. Moore et al. Branosky, E.;

Gas 218
article thumbnail

California Air Resources Board posts revised draft of strategy to reduce “Super Pollutants”

Green Car Congress

California has already cut anthropogenic black carbon emissions by more than 90% since the 1960s, and existing measures are projected to cut mobile source emissions by 75% and total anthropogenic emissions by nearly 60% between 2000 and 2020. The SLCP Strategy is due to come before the Board for consideration in March 2017.

Pollution 150
article thumbnail

California ARB Seeks Further Reductions of Diesel Emissions at State Rail Yards

Green Car Congress

The top set of recommendations call for: Replacing existing switch and medium horsepower locomotives with cleaner locomotives (2010-2013); Retrofitting switch and medium horsepower locomotive with particulate matter and oxides of nitrogen (NO x ) after-treatment devices (2012-2016); and. NO x helps create ground-level ozone, or smog.

Diesel 170