The Clark County Department of Air Quality has extended an advisory for ground-level ozone pollution through Wednesday.
The advisory, first issued Monday, now includes smoke from regional wildfires moving into the area as a contributing factor.
Exposure to ozone can irritate your respiratory system and cause coughing, a sore throat, chest pain and shortness of breath even in healthy people, according to the EPA.
The Department of Air Quality monitors air pollution through a network of monitoring sites throughout the Las Vegas valley. Data is collected from these sites and reported at the monitoring website.