The HON rule, signed by President Biden's EPA chief, aims to reduce toxic pollution from petrochemical plants in areas like Cancer Alley along the lower Mississippi River. The rule strengthens regulations on hazardous air pollutants emitted by petrochemical plants, requiring upgrades to pollution control equipment and air monitoring at fencelines. However, the Trump administration has begun unraveling these regulations, granting exemptions to petrochemical facilities and proposing a rewrite of the HON rule that may significantly scale back its protections. Communities like St. John the Baptist Parish, with high cancer risks from air pollution, are disproportionately affected, particularly Black residents. The EPA estimated a 96% reduction in cancer risk in communities near affected plants under the HON rule, which was rescinded or revised under the Trump administration, prioritizing industry interests over public health. Sharon Lavigne of RISE St. James Louisiana is fighting to restore the strength of the HON rule to protect communities in "Cancer Alley."