Read more about Joe Biden s fossil fuel moves clash with pledges on climate change on Business Standard. The clash between Mr. Biden s pledges and some of his recent decisions illustrates the political, technical and legal difficulties of disentangling the country from the oil, gas and coal
Generally, there are two local air pollutants that the U.S., EPA, and other researchers tend to focus on, explained Nicholas Muller, associate professor of economics, engineering, and public policy at Carnegie Mellon University. Those are fine particulate matter and tropospheric or ground-level ozone.
Particle matter pollution refers to tiny pieces of solids or liquids in the air that consist of contaminants like dust, dirt soot and smoke. Nearly 21 million people in the U.S. are estimated to live in counties with unhealthy levels of particle pollution year-round, Wednesday s report said. It comes very small, much smaller than a human hair, American Lung Association national senior vice president of advocacy Paul Billings said. You can often see them when you look at a sunset and you see all of that haze in the evening.