Thursday's ozone high-pollution advisory has been extended into Friday, May 31, state health officials announced.

Recommendations during high-pollution periods include:

• Drive less, carpool, use public transit, or telecommute. 
• Fuel vehicles after dark or during cooler evening hours.
• Reduce wait time in long drive-thru lines.
• Avoid using leaf blowers. Use a rake or broom to keep debris out of the road and away from storm drains, ditches and streams.
• Conserve electricity.
• Wood burning in residential fireplaces, chimeneas, outdoor fire pits and similar outdoor fires is prohibited in Maricopa County. This includes individuals and businesses with permits for open burning.
• Employees and contractors of government entities are prohibited from operating leaf blowers. Residents are encouraged to avoid leaf blowing.
• Off-highway vehicles are prohibited from being used.