Councillor Zahid Badroodien with team to examine Air Quality in Milnerton Lagoon, Cape Town

Cape Town monitoring station examines Air quality around Milnerton Lagoon 

This monitoring is part of the broader efforts put by the City of Cape Town to protect public health and transparently share critical information with residents as they work to restore the environment at Milnerton Lagoon. 

Khumalo Lubanzi
4 Min Read

Cape Town: An ambient air quality monitoring station is now in place to better monitor air quality around Milnerton Lagoon. It also shares the information with the public as part of the City of Cape Town’s broader efforts to restore the lagoon environment. 

Reportedly, by the end of July, the temporary station at the Woodbridge Island Complex will move to a permanent location at the Milnerton Canoe Club parking area, becoming the 14th station in the Air Quality Monitoring network across Cape Town.    

Since the installation of the monitoring station in February 2025, the SSB detected varying levels of Hydrogen Sulfide (H₂S), which comes under the World Health Organisation’s (WHO) health effects guidelines of 150 micrograms/24 hours. 

Member of the Mayoral Committee for Water and Sanitation – Councillor Zahid Badroodien said that that they acknowledge the smell nuisance caused by H₂S, and the monitoring data confirms the experience of the community.  

According to Badroodien, this monitoring is part of the broader efforts put by the City of Cape Town to protect public health and transparently share critical information with residents as they work to restore the environment at Milnerton Lagoon. 

Air Quality Monitoring Station, Cape Town
Air Quality Monitoring Station, Cape Town

Hydrogen Sulphide (H₂S)  

H₂S is known as a nuisance gas due to its characteristic rotten egg odour, which humans can detect even at extremely low concentrations. The gas is colourless, flammable, and toxic, especially in high concentrations in confined spaces.  

It can be found in various environments, including sewer systems, oil and gas industries, and also as a by-product of certain industrial processes. As South Africa does not have an ambient air quality standard for H₂S, the City utilizes WHO mandatory guidelines. 

Monitoring and Results

The temporary station is a mobile mini-laboratory, which is equipped with a continuous ambient air quality analyser. This analyser measures H₂S levels 24/7, taking readings every 10 to 15 seconds. Data is automatically stored and analysed to assess exposure to international standards.

Key findings from 100 days of data indicated that while foul odours may be experienced at times, there were no exceedances of the World Health Organisation’s 24-hour average health guideline. Should residents experience any worrying symptoms, they encourage residents to consult their local health practitioner when required. 

Councillor Zahid Badroodien with team to examine Air Quality in Milnerton Lagoon, Cape Town
Councillor Zahid Badroodien with team to examine Air Quality in Milnerton Lagoon, Cape Town

Making readings available to the public

The City of Cape Town is also engaging the National Department of Forestry, Fisheries and the Environment and the South African Weather Service to publish H₂S readings on the South African Air Quality Information System SAAQIS platform for public access. The benefit of this will be that the public will have direct access in real time to the data published on the site, either via the SAAQIS App, which is downloadable free of charge to your cell phone either via your Android or IOS App Store or via the SAAQIS website.

In addition to this station at Woodbridge Island, the SSB has 13 other locations where they are monitoring air quality namely: Athlone, Atlantis, Bellville South, Bothasig, Cape Town – Foreshore, Goodwood, Khayelitsha, Molteno, Plattekloof, Somerset West, Potsdam, Table View and Wallacedene. 

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