Air quality monitoring · South Africa

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Why it matters

South Africans are breathing air that nobody is measuring.

Here’s what’s been reported.

Johannesburg · March 2026

The city smelled
of rotten eggs.
Again.

Hydrogen sulphide hit 36 ppb in Buccleuch and Alexandra — the second time this year. Not one building nearby had a record of what its people breathed.

36 ppb
hydrogen sulphide confirmed at city monitoring stations
Daily Maverick · 11 March 2026
2
separate episodes across Johannesburg in 2026 alone
City monitoring records
0
buildings able to say what their own occupants were exposed to
No indoor monitoring requirement exists in SA
The source · Still unnamed

Nobody could say
where it came from.
That is the problem.

The episodes were measured, never explained — and most South Africans live far from any monitoring station.

40%
of South Africans live more than 25 km from any air quality monitoring station
SA Department of Environment
2022
High Court ruled Highveld air violates the constitutional right to a healthy environment
Centre for Environmental Rights
Below the smell threshold

You stop smelling it
long before
it stops working.

Your nose stops noticing it long before it stops affecting you: headaches, poor memory, poor focus.

~70 ppb
concentration at which H₂S becomes detectable by smell
WHO air quality documentation
Below
that threshold, neurological effects are documented on repeated exposure
University of Michigan · Crit Rev Toxicol
Beyond Johannesburg

It is not one city,
and it is not
one bad week.

The Vaal has recorded the world’s highest PM2.5. All 13 Mpumalanga preschools tested were over the WHO limit.

54
deaths a day in Johannesburg attributed to outdoor air pollution
IQAir / Clean Air Fund · 2023
1.7m
people living beside the most polluted air measured on Earth, in the Vaal
Bloomberg / Daily Maverick · 2024
13/13
Mpumalanga preschools measured over the WHO threshold. Every one.
Public Health Challenges · peer-reviewed

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Outdoor pollution score for your town, compared with its own clean days. Not medical advice — terms.

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Johannesburg · Pretoria · Vaal · Durban · Cape Town

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