Air quality is a measure of the pollution level in the air. Polluted air can be caused by many things. There are manmade and natural sources of emissions. 

The products of science are explanations and the products of engineering are solutions.

Background information on ocean circulation.

Review this page to learn about the background of volcanoes and their eruptions.

Image Credit: NASA

The data visualization tool for My NASA Data, the Earth System Data Explorer, provides access to dozens of datasets. It can be used to produce maps, time series plots, and data tables which can be downloaded. 

Explore the energy and matter cycles found within the Earth System. 

Background on changing albedo values.

Phytoplankton distribution background information.