Infrastructure

Expert Voices

How cities are cutting down on light pollution

View of the U.S. at night with city lights.
View of the U.S. at night. Photo: NASA via Getty Images

As cities invest in technology upgrades, they have an opportunity to reduce light pollution, which impacts 99% of people in the U.S. and Europe.

Why it matters: Pollution is typically thought of as air, water and soil contamination, but light pollution — including from streetlights that cast excessive light — also harms the environment, human health and the stability of the global ecosystem.

Expert Voices

Mobility data could give cities new tools to improve equity

Illustration of arrows going in different directions, casting shadows with binary code in them
Illustration: Sarah Grillo/Axios

As mobility data is amassed from ride-hailing, dockless bikes and e-scooters, cities need tools to responsibly track, store, and analyze it.

The big picture: With cities collecting that mobility data, in some cases as a condition for transportation companies to operate, they are facing a new challenge: how to be responsible stewards of this influx of data.