The new report says that 85 million people in the US live in an area with a failing grade for year-round particle pollution, ... Air pollution levels keep getting worse for more people in the ...

NGSS 2-PS1-1: Plan and conduct an investigation to describe and classify different kinds of materials by their observable properties. Summary. Students have looked at the properties of solids and in ...

At least 156.1 million people live with air that got the poorest grade of F for at least one pollutant, and at least 42 million people live in counties that failed all three pollutant standards.