Wildfire smoke from Canada is expected to move over the U.S., and maps and satellite imagery show the large-scale impact of the blazes.

More than 1,000 tornadoes sprout up across the US in the average year, causing billions of dollars in damage and killing scores of Americans. Track them here.

The EPA has an action level of 148 Bq/m 3, and the average outdoor ... Koutrakis, High-resolution national radon maps based on massive indoor measurements in the United States, Proc.

so when we see a percentage like that we might not realize how many waterways there are in the United States and how many are threatened. The map above gives you an idea of the number of rivers ...

Pine Hollow Arboretum is one of many botanical gardens rethinking their planting strategies as the climate warms. These ...

You can get in touch with Marni by emailing [email protected] ... requirement for public schools. A Newsweek map shows which states mandate sex and HIV education.... Courtney Normand, director ...

Here is an index map of 20 major timber types in the United States as defined by the Society of American Foresters. Each forest type listed on the map is presented where it most frequently occurs ...