Sulphur-like smell in Gauteng may be coming from Mpumalanga, investigation finds

An investigation into the strong sulphur-like smell reported across parts of Gauteng has found that the odour may be drifting into the province from Mpumalanga.

Residents over the past few days have described the smell as similar to rotten eggs, burning sulphur or even cat urine.

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The Gauteng Department of Environment said the smell is characteristic of similar incidents previously recorded in the province.

The department said its investigation included site inspections, air quality monitoring and meteorological analysis, but no incidents were found at facilities within Gauteng that could explain the widespread odour.

Data from the Three Rivers ambient air quality monitoring station shows prevailing winds during the period were blowing from the east and north-east, suggesting pollutants may have travelled from Mpumalanga into southern Gauteng.

The smell is believed to be linked to hydrogen sulphide - a gas known for its distinctive rotten-egg odour that can be detected even at very low concentrations.

Officials said while the odour may cause discomfort, headaches or nausea for some people, it is not expected to pose serious health risks at the levels experienced.

The matter has now been referred to the national Department of Forestry, Fisheries and the Environment for further investigation.