Unit of measurement based on number of particles.
1Jim's voice said, They took air samples, measured in parts per million.
2And just how many parts per million carbon dioxide are too many?
3The United States allows 10 parts per million of DPA residues in food.
4Atmospheric carbon dioxide has not dropped below 250 parts per million.
5Sometimes the data were reported in percentages and sometimes in parts per million.
6Transneft allows no more than 10 parts per million (ppm) of organic chlorides.
7That corresponds to a rise in atmospheric carbon to 430 parts per million, or ppm.
8He did not see things in parts per million.
9Carbon dioxide now sits at 400 parts per million.
10Many types of fish struggle or die when oxygen is below 5 parts per million.
11Five of these patients received prolonged treatment with NO at 20 parts per million or less.
12It is also continuing to rise at a rate of about two parts per million every year.
13On the present course, it could be 800 parts per million by the end of the century.
14He added: Already levels of CO2 have exceeded 400 parts per million.
15But installing systems large enough make a dent in all those parts per million is functionally impossible.
16Only a few parts per million of ammonia would be enough to offset the faint young sun.
Translations for parts per million