The death toll from the Angelo Informal Settlement in Boksburg, east of Johannesburg, remains at 17. It was confirmed to be a gas leakage from a gas cylinder from one of the yards within the informal settlement. The cylinder is suspected to have been used for illegal mining activities. Members of the community, among them a one-year-old inhaled nitrate oxide from the leaked gas cylinder. Dr. Kagiso Thomas helps us understand how dangerous nitrate oxide.