The heat wave poses significant risks to vulnerable populations, including the elderly, young children, and those without access to air conditioning. Outdoor workers and individuals engaging in strenuous activities are also at heightened risk of heat exhaustion or heat stroke. The NWS has warned of elevated fire risks in valleys and mountainous areas, with potential for tall fire plumes. Air quality in parts of Los Angeles County is expected to range from 'unhealthy for sensitive groups' to 'very unhealthy,' exacerbated by particle pollution from a recent warehouse fire in Boyle Heights.