The poor air quality is most concentrated in Boyle Heights, East Los Angeles, Downtown Los Angeles, and neighborhoods downwind of the fire. Those most at risk include individuals with respiratory or heart conditions, older adults, children, pregnant people, and anyone spending extended time outdoors. Exposure to fine particle pollution can lead to breathing difficulties, asthma attacks, heart problems, and reduced lung function. Even areas with moderate AQI levels may pose risks to sensitive groups, and symptoms can occur even if smoke is not visible.