Lanzhou was one of the most air-polluted cities in China over the past few decades due to its narrow river valley topography and industrial emissions.

Ever since the industrial revolution, nitrogen fixation induced by human activities has considerably altered the nitrogen cycling process on the Earth.

Researchers found that PM2.5 showed different pollution characteristics and mechanisms under the artificial control and synoptic situations.

In Senegal, groundnut and maize are commonly contaminated with highly toxic, cancer-causing chemicals called aflatoxins, which are produced by fungi in the genus Aspergillus when they infect crops.

Professor Kenneth Leung and his research team have been monitoring organotin pollution in the marine environment of Hong Kong since 2004.

A Washington State University research team has found that nanoscale particles of the most commonly used plastics tend to move through the water supply, especially in fresh water, or settle out in wastewater treatment plants, where they end up as sludge, in landfills, and often as fertilizer.

Excess electrons could help break the strong chemical bonds in products that contaminate water supplies.

In Chester County, Pennsylvania, about 40 miles northwest of Philadelphia, Beaver Run carves a triangular piece of bottomland as it turns east to join French Creek. 

Breathing dirty air takes a heavy toll on gut bacteria, boosting risk of obesity, diabetes, gastrointestinal disorders and other chronic illnesses, new University of Colorado Boulder research suggests.

One bayou meanders toward downtown Houston. The other runs in parallel to the south, much of it through a concrete channel.