While some forests emit volatile organic compounds that are involved in ozone pollution, history shows attempts to control smog have a better chance of succeeding by focusing on vehicle emissions.
Though Earth's ozone layer has been depleted over the past four decades by chlorofluorocarbons (CFCs) and similar chemical compounds, the changes are expressed differently at the North and South Pole
After ten years in orbit, the Ozone Monitoring Instrument (OMI) has been in orbit sufficiently long to show that people in major U.S. cities are breathing less nitrogen dioxide--a yellow-brown gas that can cause respiratory problems.
