Road transportation nitrogen oxide emissions in the U.S. 1970-2022
Road vehicles in the United States emitted 2.1 million tons of nitrogen oxide (NOx) in 2022. Emissions of NOx from road vehicles have fallen considerably in the United States since the Clean Air Act was passed in 1970. Since then, increasingly stringent standards have resulted in NOx emissions from road vehicles to fall more than 80 percent relative to 2002 levels.
Heavy-duty trucks are a major source of transportation emissions in the U.S.. In November 2020, the EPA announced the launch of the Clean Trucks Initiative in a bid to decrease NOx emissions from HDVs.
Heavy-duty trucks are a major source of transportation emissions in the U.S.. In November 2020, the EPA announced the launch of the Clean Trucks Initiative in a bid to decrease NOx emissions from HDVs.
