"In 2015 and 2016, we reached the peak for air pollution," says Paula Palacio, who was Medellin's local infrastructure secretary at the time. "It was a very critical moment in environmental issues".

The city of Medellin stretches through a valley. Dozens of high-rises soar into the sky. Thousands of trees blossom along green corridors local officials planted to reduce air pollution and keep ...

Scientists are beginning to understand how breathing air filled with pollution impairs the immune system’s ability to regulate inflammation. Air quality has long been a concern in South ...

Air in the U.S. has gotten cleaner for decades, adding years to people's lives and preventing millions of asthma attacks, but nearly half of Americans still live with unhealthy air pollution ...

According to the report, around 46% of people in the U.S. live in an area that received a failing grade in at least one of the three measures that were studied: short-term particle pollution ...