Researchers have found the oldest known evidence of lead pollution dating to around 5,200 years ago in ancient Greece.

Every year, the UN campaigns to raise awareness about environmental issues like marine pollution, increasing carbon emissions, and overpopulation. In 2019, the focus is addressing air pollution.

Economic losses were in the billions. Pollution takes many forms in India, including the use of poorly-ventilated stoves and open fires for cooking inside dwellings. Photo by Mark Katzman. Air ...

Air pollution was also a huge issue in the city. As seen in this 1973 photo, smog obscures the George Washington Bridge. In the first six months of 1973, more than 300 oil spills occurred in the ...