Underneath the streets of Australia's major cities, sewer pipes transport human waste, leading to the production of foul-smelling hydrogen sulphide gas. In Canberra, waste managers utilize ventilation and odour control units (OCUs) to extract and filter foul air before releasing it back clean. Additionally, chemical dosing projects, such as the one at the University of Queensland, aim to eliminate hydrogen sulphide and reduce corrosion in sewer infrastructure. Researchers emphasize the importance of controlling hydrogen sulphide not only to address odour concerns but also to prevent hidden corrosion, which has significant economic and environmental consequences. Real-time monitoring and algorithms are being developed to strategically release chemicals into the sewer system to target areas with hydrogen sulphide buildup.