The most important source of carbon monoxide emissions in the United States is

Question

Quizplus · Accepted Answer

Automobile engines are the most important source of carbon monoxide emissions in the United States, responsible for more than 50% of all emissions. Coal-fired energy plants and industrial processes also contribute to carbon monoxide emissions, but to a lesser extent compared to automobile engines. Natural emissions, such as those from wildfires and volcanoes, are not a significant contributor to carbon monoxide emissions in the United States.

The Most Important Source of Carbon Monoxide Emissions in the United