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Africa's first roadside vehicle emission data sensors went live in Johannesburg, the wealthiest city in South Africa, in July. The goal is to measure the tailpipe carbon dioxide (CO2) emissions from a batch of 100,000 vehicles daily. To date, no city in sub-Saharan Africa has implemented car emission-free zones like those in Paris or Amsterdam. South Africa  is the 13 th  most carbon-polluting economy on earth. Raeesa Moolla , an air quality expert at the city's Wits Universi