Severe shortages of medical oxygen across sub-Saharan Africa have robbed many patients with severe COVID-19 and pneumonia of a key time-buying treatment. Activists blame 2 suppliers, The Linde Group and Air Liquide, that monopolize the market—overcharging and limiting…

In wealthier countries, running out of medical oxygen “is all but unthinkable for a resource that literally can be pulled from the air,” the AP reports. But in low-resource countries, it is expensive and in short supply, with soaring demand amid the pandemic.

Hospitals throughout sub-Saharan Africa can’t obtain enough medical-grade oxygen for patients who need it. Low blood oxygen, or hypoxemia, accompanies many conditions, from trauma and pregnancy complications to pneumonia. Now, a Kenyan entrepreneur has created a system for…