Mississippi Department of Environmental Quality; require to evaluate toxic air pollutants and revise air quality standards.

HB 719 requires Mississippi's Department of Environmental Quality (MDEQ) to identify up to five toxic air pollutants posing heightened health risks to infants and children, and to establish a list of these substances within the bill's timeframe. The MDEQ must review existing control measures for listed pollutants within two years and, within three years, prepare reports on the need for new regulations for up to five unregulated pollutants, followed by adopting appropriate control measures to reduce public exposure. The department must annually evaluate at least 15 toxic air pollutants, provide health exposure thresholds, and update the list by July 1, 2026, with annual revisions thereafter. This bill directly affects public health protections for vulnerable populations by mandating MDEQ action to address air quality risks through specific timelines and reporting requirements.