Ozone monitoring continues to improve, researchers report

The troposphere comprises the lowest layer of Earth's atmosphere, stretching from the planet's surface to a little over eight miles into the sky. It also contains about 10% of the ozone in the atmosphere, but that 10% is heavily influenced by human activity and plays a critical role in the formation of smog, which is hazardous to human health, according to an international team led by researchers with the Chinese Academy of Sciences (CAS).