GreenFlag Association

Who we are

The GreenFlag Association started as a partnership between one of South Africa’s leading environmental health and safety organisations, Apex Environmental, and enterprise and development agency, Supplier Development Initiatives (SDI). The initiative aims to increase awareness about the importance of proper ventilation in public spaces to people’s health.

By issuing GreenFlag certification to compliant institutions, the GreenFlag Association provides a standard of measurement that could partly serve as evidence of their efforts to maintain a healthy, safe environment, when authorities consider implementing shut-downs.

Similar to the Blue Flag beach status and the Tourism Grading Council’s issuing of stars to tourism venues, Green Flag certification signals to potential clients and customers that the venue is a safe space to visit.

Why get GreenFlag Certification?

GreenFlag certification offers a number of benefits to both the owners or managers of public spaces and their customers.

To the customers it provides peace of mind that the venue is safe to visit.

Venue owners have a standard to rely on when communicating their efforts to create a safe and healthy space.

  • Customers feel safe
  • Attracts more business
  • Provide evidence to authorities that the space is safe
  • Monitoring on an ongoing basis
  • Staff are healthy and productive

Mission Statement

GreenFlag Association is an international organisation aimed at reducing the transmission of COVID-19 and other airborne pathogens in closed-air public spaces. This multidisciplinary association comprises international scientists, academics, and business representatives who operate collaboratively to provide practical solutions. GreenFlag operates on an inclusive, transparent, and non-political basis.


Around the world, there has been a lack of clear communication about the airborne nature of COVID-19 and the substantial risks of poorly ventilated environments. Despite the now overwhelming evidence that trapped exhaled air is the main source of Superspreader incidents, this continues to be the case. The result is a critical failure to ensure that public spaces, like restaurants, public transport, and shops, are adequately ventilated. Greenflag Association was established in response to this, to provide advice and innovative solutions that will save both lives and –  by keeping the economy open –  livelihoods. GreenFlag also aims to promote healthier and safer public spaces in general.

Green Flag Association

Our founders


Sean Chester

co-founder, panellist

Email: sean@apexenviro.co.za

Sean Chester is the Technical Director of Apex Environmental, which is one of the major environmental companies in South Africa. Sean holds an MPH in Occupational Hygiene from Wits University and is a Registered Occupational Hygienist and a Registered Senior Assessor at the Southern African Institute for Occupational Hygiene (SAIOH)


Charles Murray


Email: Charles@sdi.co.za

Charles Murray is the CEO of SDI. He has extensive experience in business management, especially in tech and startup environments. He has built up a wealth of knowledge in IT, telecommunications and platforms in South Africa and the rest of Africa.

Who can benefit from GreenFlag Certification?

Green Flag Association

Benefits of getting GreenFlag certification

Safe working and business environment

Prevent the spread of airborne diseases, pathogens and other toxic pollutants in private and public spaces by ensuring proper ventilation, thereby doing your part to keep your community healthy.

Peace of mind for customers

Inform customers of your Green Flag status to give them the peace of mind that your space is safe to enter and has enough ventilation to minimise possible health risks.

Prevent blanket lockdowns

Strengthen your company’s – and industry’s – position against any blanket lockdowns by authorities by providing relevant, up to date evidence of the safety of your space.

Build and gather data

Be part of a community that gathers data on an ongoing basis to establish how airborne diseases and pollutants spread in public spaces.