Air quality officials have issued a health caution because of smoke caused by wildfires. The caution will be in effect until the fires are extinguished.

“Due to the erratic nature of the smoke, areas of the eight-county air basin could potentially be affected at any given time,” said Shawn Ferreria, senior air quality specialist for San Joaquin Valley Air Pollution Control District, in a statement.

Since late last month, air quality officials have been advising Kern County and San Joaquin Valley residents to stay indoors as much as possible because of poor air quality caused in part by wildfire smoke wafting into the valley from fires.

That advisory continues. Particulates can aggravate lung and heart disease, trigger asthma attacks and acute bronchitis.

The nearby Piute fire had burned more than 30,000 acres as of Tuesday morning.