As coal chokes Johannesburg, South African scientists launch pollution warning app

As coal chokes Jo'burg, South Africa scientists launch pollution app

As coal chokes Johannesburg, South African scientists launch pollution warning app

Scientists at the University ​of Witwatersrand have designed South Africa's first app to warn residents of pollution levels, as ‌Johannesburg suffers a spike in coal emissions in recent weeks, causing breathing problems and other health issues.