The question sounds simple. The answer, once you examine the actual measurement science behind it, is more interesting than either "yes" or "no." ...

Health advocates fear that a massive federal review of the risks posed by soot and other air pollution could be undermined by a new Environmental Protection Agency policy that would block the use of ...

Since 1980, emissions of six common air pollutants have decreased by 67%, thanks largely to government regulation. At the same time, U.S. gross domestic product has increased by 165%. While some ...

Scientists who last year built a prototype harvester to extract water from the air using only the power of the sun have scaled up the device to see how much water they can capture in arid conditions ...

For the first time, scientists have seen exactly how towering clouds that rise from intense wildfires launch smoke high into the atmosphere, where it can linger for months and mess with the protective ...