A recent study in 12 south-west Nigerian hospitals found that of 57 oxygen concentrators, only 5% (3/57) were producing medical-grade oxygen (defined as >85% purity), and 48% (24/50) of those that turned on and blew gas were simply blowing out air. Data from hospitals in northern Nigeria showed that the situation was even worse in these poorer, more rural, locations. 11https://onlinelibrary.wiley.com/doi/10.1002/ppul.24656
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