Low-cost device can measure air pollution anywhere

Air pollution is a major public health problem: The World Health Organization has estimated that it leads to over 4 million premature deaths worldwide annually. Still, it is not always extensively measured. But now an MIT ...

In Global South, urban sanitation crisis harms health, economy

Cities in the "global south"—densely populated urban areas that are part of low-income countries in Asia, Africa and Latin America—should phase out pit latrines, septic tanks and other on-site methods of human waste management.

Q&A: Urban doom loop—what it is and how cities can stop it

Recent images of downtown San Francisco—emptied of office workers now dialing in remote and filled with wandering homeless people—has struck fear for the future of urban areas. A Columbia University professor coined the ...

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