JOHANNESBURG - What's that smell?
Joburg residents woke up to a foul stink on Wednesday and many are wondering where it's coming from.
According to IQAir, the air pollution level in Johannesburg is quite high and unhealthy for sensitive groups.
At midday Wednesday the PM2.5 concentration was 10.7 times the WHO annual air quality guideline value.
Atmospheric Chemistry and Air Quality Expert Rebecca Garland from the University of Pretoria has more on this.