Smog returns to Indian capital as agriculture fires start

The Indian capital's air quality levels plunged to "very poor" on Friday and a smoggy haze settled over the city, days after the state government initiated stricter measures to fight chronic air pollution.

Kamchatka marine life death caused by algae: Russian scientist

The mass death of sea creatures in Russia's Kamchatka region was caused by toxins from microalgae rather than man-made pollution, a senior Russian scientist said on Monday, citing preliminary findings of an investigation.

School absences correlate to impaired air quality

In Salt Lake City schools, absences rise when the air quality worsens, and it's not just in times of high pollution or 'red' air quality days—even days following lower levels of pollutions saw increased absences.

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Pollution

Pollution is the introduction of contaminants into an environment that causes instability, disorder, harm or discomfort to the ecosystem i.e. physical systems or living organisms . Pollution can take the form of chemical substances, or energy, such as noise, heat, or light energy. Pollutants, the elements of pollution, can be foreign substances or energies, or naturally occurring; when naturally occurring, they are considered contaminants when they exceed natural levels. Pollution is often classed as point source or nonpoint source pollution. The Blacksmith Institute issues annually a list of the world's worst polluted places. In the 2007 issues the ten top nominees are located in Azerbaijan, China, India, Peru, Russia, Ukraine and Zambia.

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