Despite the evacuation order being lifted last week, locals have since questioned authorities' assurances that the area is safe. More than 3,500 fish have been killed due to the toxic runoff, while footage of the aftermath shows plumes of toxic smoke still lingering in the area. Some residents are also reporting persistent coughs, while farmers in the area claim their livestock are dropping dead in large numbers. The EPA said Tuesday they have carried out 'robust air-quality testing' in and around the area of the crash, and confirmed they have 'not detected any levels' of chemicals that could cause harm.