LAS VEGAS (KLAS) -- Persisting wildfire smoke prompted the Clark County Department of Environment and Sustainability (DES) to extend the current smoke advisory through Thursday, Sept. 24.

The department says the smoke can aggravate respiratory diseases, like bronchitis and asthma, or heart disease due to the dust particles and other pollutants found in smoke. Authorities urge children, the elderly and people with the aforementioned conditions to stay indoors.