People with coronary heart disease have higher levels of the enzyme in their system; thus, elevated concentrations can serve as early warning signs.

Ocean acidification, in turn, is associated with elevated atmospheric concentrations of CO2.

Many microphiles are also capnophiles, as they require an elevated concentration of carbon dioxide.

About 1,200 of the 1,500 homes showed a slightly elevated concentration of radon gas.

The seawater is characterized by the elevated concentration of dissolved oxygen that results in high biological productivity.

An exception of note is elevated concentrations of detergent.

Soybeans grown in sewage sludge likely contain elevated concentrations of metals.

It matters how long the stuff stays at elevated concentrations.

An elevated concentration of autoantibodies that block interferon-gamma was detected in most patients.

Researchers suggest that even short-term exposure at elevated concentrations could significantly contribute to heart disease.