On Thursday, the Department of Environment, Forestry and Fisheries will visit a Sasol plant in Secunda which is suspected to be behind a sulphuric smell enveloping parts of Gauteng and Mpumalanga. Sasol said its Secunda operations have been stable and there were no operational incidents that could have resulted in an increase in sulphur emissions. Although elevated, the levels of sulphur in the air are still compliant. The Department of Environment, Forestry and Fisheries will on Thursday visit the Sasol plant in Secunda which is suspected to be behind a sulphuric smell that is enveloping parts of Gauteng and Mpumalanga since the weekend.