South African scientists have developed a new air pollution warning app as Johannesburg faces a surge in coal-related emissions that have triggered widespread health concerns. The app, created by researchers at the University of the Witwatersrand and announced in April 2026, is designed to alert residents to dangerous air quality levels in real time, as reported by Reuters.
The initiative comes as South Africa’s largest city experiences spikes in sulphur-related pollution, linked to coal mining and industrial activity across the region. Environment Minister Willie Aucamp said emissions, including hydrogen sulphide from operations up to 400 kilometres away, have contributed to the persistent “rotten-egg” smell and rising respiratory issues among residents.
The app, developed under the South African Consortium of Air Quality Monitoring (SACAQM), uses data from hundreds of monitoring stations to send alerts and health guidance, including when to limit outdoor exposure. Researchers say the system detects increasing pollution spikes, helping communities better respond to air quality risks in a country where coal still generates about three-quarters of electricity.
The development highlights growing concern over the economic and health costs of pollution in South Africa, particularly as major emitters such as Sasol and Eskom continue operating under extended emissions limits. The launch of the app reflects a broader shift toward data-driven environmental monitoring, positioning technology as a critical tool in addressing urban air pollution challenges across Africa.
