When feldspar occurs near the surface of lava flows, the CO concentration is high, and reaction rates are rapid.

Atmospheric CO concentration is 0.03%, but in the soil pore space it may range from 10 to 100 times that level.

Normal CO concentration in the atmosphere is 0.03%, which is probably the factor limiting plant growth.

Within hours of quitting, CO concentrations show a noticeable decrease, and this can be encouraging for someone working to quit.

This will also reduce CO concentration if that is high.

It has been shown to be inducible by limiting and varying the CO concentration in planted aquariums.

The CO concentration also has an effect on algae growth and lipid content.

Nationally, average CO concentrations have decreased substantially over the years.

Consequently, new alarms will not sound at CO concentrations up to 70 ppm.

Since air movement is reduced in microgravity, local pockets of increased CO concentrations may form.