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). 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). Environment Phys.org – latest science and technology news stories