Toxic Day 4 is known for a Pfizer toxic chemical spill. The severity of the spill won’t be known for days. This information is based on a report from MLive.com. The report does not provide further details about the spill, such as its cause, location, or the chemicals involved. It only mentions that the severity of the spill will not be known for days. The report does not provide any information about the potential impact of the spill or any actions being taken by Pfizer or regulatory agencies. The report is brief and does not contain any additional details about the spill.