Allegheny County warns that Sunday is expected to be a poor air dispersion day, meaning that pollutants may be trapped close to the ground, potentially affecting sensitive populations.

On days in which the air quality is unhealthy, people with sensitivities to air pollution are warned to schedule outdoor activities in the morning when ozone is lower, or late afternoon when particulates are lower, and reduce prolonged or heavy outdoor exertion. People with sensitivities are also urged to watch for symptoms such as coughing or shortness of breath, and, if asthmatic, to keep quick-relief medicine handy.

To improve air quality, residents can limit daytime driving, combine trips, avoid prolonged idling, postpone mowing and refueling vehicles until after 7 p.m., take general energy-saving measures and avoid burning wood outdoors.

Rich Lord: rlord@post-gazette.com or 412-263-1542

First Published: May 11, 2019, 5:07 p.m.