Comparison between Mexico City smog in 1997 and 2008

Mexico City’s Air Quality Challenge

Mexico City’s decades-long, uphill battle to clear the air is a study in pollution with lessons for cities worldwide, especially New Delhi and other Indian cities now on the top 20 most polluted cities list. Mexico City topped that list in 1992.

Drawing of people connecting giant electrical plug

Working Together to Grow Clean Energy In India

The U.S. India Partnership to Advance Clean Energy (PACE), launched in 2009, was re-energized in September 2014, when Modi and Obama committed to expand the initiative. It has so far brought $2.4 billion in public and private investment in clean-energy projects from the United States to India.

People riding bikes in LA.

Once Smog-Shrouded, LA Has Improved Its Air Quality

Los Angeles, or LA, may be among the U.S. cities with the dirtiest air, but it’s breathing much more easily than it did a few decades ago, when cars, refineries and backyard incinerators spewed greenhouse gases and particulate matter unchecked. Technology and today’s strict controls on automobile and industrial emissions accomplished this change.

Beekeeper walking on Chicago rooftop

Sister Cities Chicago, New Delhi Strategize to Clear the Air

Busy hubs of industry, transit and economic power, Chicago and New Delhi have much in common. They are also official sister cities, cooperating culturally and commercially, exchanging expertise in education, infrastructure and other areas of mutual concern.

Smoke stacks in an industrial setting

Need Strategies to Clear the Air? Ask a Megacity.

Much of the world’s air pollution originates in large cities, and their smog can be carried thousands of miles, affecting the health and livelihoods of people who live outside urban areas. But big city mayors around the world are stepping up to develop new strategies to control air pollution.

An electrician installs “smart meters” at a Portland, Maine, apartment building. (© AP Images)

Power to the People the Smart-Tech Way

What if every month you got a report on how your electricity use compared to that of your neighbors? And personalized tips on how to save money based on your own usage patterns?