India’s ubiquitous electricity generators are largely to blame for Delhi’s dangerous levels of particulate matter—which stretch well beyond the WHO’s safety limit. How to stop all that soot from entering the air? Think ink. With its namesake “Chakr Shield,” the startup…

As Accra’s swelling population outgrows its supply of quality water, 500ml plastic packets of water have become a wildly popular. They offer a middle ground between pricey bottled water and suspect tap supply, but a patchwork of producers and lack of regulation raises…

India’s Bellandur Lake in Bengaluru is prone to bursting into flames, while a detergent-like foam sometimes tops the Yamuna river flowing through New Delhi.