Putting aerosols in the stratosphere to reflect sunlight could prevent the shutdown of key ocean currents, but only if it is ...

Emissions testing is required in Northwest Indiana, and nowhere else in the Hoosier State, because the federal government groups Lake and Porter counties with Chicago for air-quality purposes.

Find out what nitrogen oxides (NOx) are, why they are a serious environmental concern, and what role they play in the Volkswagen diesel engine scandal.