Pollutant

Lutyens’ Delhi is one of the most iconic neighborhoods of India’s capital. Home to the country’s parliament, numerous embassies, and a lush, 90-acre Mughal-era park, it’s an architectural paradise, connected by tree-lined streets and roundabouts with mini-gardens. Yet despite being one of the city’s most refined districts, this clean, green neighborhood is home to something sinister. It is a hot spot for a dangerous and overlooked air pollutant: ozone.India is no stranger to pollution, with many of its cities reporting…

In the U.S., people eat more protein than they need to. And though it might not be bad for human health, this excess does pose a problem for the country’s waterways. The nation’s wastewater is laden with the leftovers from protein digestion: nitrogen compounds that can feed toxic algal blooms and pollute the air and drinking water. This source of nitrogen pollution even rivals that from fertilizers washed off of fields growing food crops, new research suggests. When we overconsume protein—whether it comes from lentils,…