ppm

1. Also PPM, P.P.M., p.p.m. parts per million.
2. pulse per minute.

ppm

abbreviation for

1. chem parts per million
2. AlsoPPM peak programme meter

Example Sentences

Measurements taken at the Mauna Loa Observatory in Hawaii indicate that CO2 levels are currently around 423 ppm.

From Los Angeles Times

As it entered the tube, the Berkeley air contained CO2 in concentrations ranging from 410 ppm to 517 ppm.

From Los Angeles Times

The EPA issued separate guidance for households with multiple sources of exposure, such as both lead-contaminated soil and lead pipes, setting the level in those situations at 100 ppm.

From Science Daily

"I assumed it was going to be a more modest number. And results for the 100 ppm guideline are even worse."

From Science Daily

Some states had established their own lower guidelines; California has the lowest screening level, at 80 ppm.

From Science Daily