NEBRASKA -- This week should have plenty of nice summer days, but people in some parts of the state may need to monitor air quality. 

In places like Lincoln, Omaha, Grand Island and Beatrice, air quality could become unhealthy for sensitive groups. 

The conditions are currently moderate, one state below good, but it could fall to unhealthy levels for those who have respiratory issues, as well as children, the elderly and immunocompromised. 

Parts of northeast Nebraska experience unhealthy air quality over the weekend. 

Heat during the afternoon helps drive the chemical reaction leading to the generation of ground-level ozone, leading to the unhealthy air quality.

Health officials advise waiting until evening to mow the lawn and fuel cars to help limit the unhealthy conditions.