What causes the smog in southern New Brunswick?
Most of the ground-level ozone over southern New Brunswick comes from the contribution of long-range transport of pollutants from the industrial areas of the U.S., such as the Boston to Washington corridor and the Ohio Valley. Also, weather conditions and patterns in the Maritimes and the regions to the south and south-west can also affect ground-level ozone concentrations. Therefore acceptable smog levels can be exceeded in cloudy, as well as sunny weather, with an equal number of exceedances occurring both during the day and night.
