The smoke has led to deteriorating air quality in affected areas, ranging from 'unhealthy for sensitive groups' to 'unhealthy for all individuals' in regions with heavy smoke. Lighter smoke impacts may result in air quality conditions varying from 'moderate' to 'unhealthy for sensitive groups.' Residents in Temecula, Murrieta, and Lake Elsinore are advised to take precautions, especially those with respiratory conditions, children, and the elderly.