Their goal is clean air, clean water, and the safe management of waste. The ozone watch and warning program and is based on forecast and measured levels of ozone in the atmosphere. The jet stream moves to the Northern Plains during this time with generally light wind and high pressure aloft over the state.
Air tends to sink, or subside, under high pressure.
At the surface, the wind is generally lighter in summer that at other times of the year. The combination of the sinking air and light surface wind helps to trap the pollution over the heavy traffic congestion in and around the Metroplex. The highest measured levels of ozone are considered unhealthy for sensitive groups. Everyone, especially children, should limit prolonged outdoor exertion. People with respiratory disease, such as asthma, should avoid prolonged outdoor exertion.