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There are 22 clues with the answer 'PPM'
# CLUE
1.
Meas. of concentration
2.
Pollution meas. hidden in "Lippmann"
3.
Project portfolio management
4.
Scientific notation used to denote relative proportions in measured quantities as in parts per million (1,1,1)
5.
Unit of minute concentrations of pollutants (abbrev.)
6.
Printing speed measurement
7.
Pollutant concentration meas.
8.
Scientific notation used to denote relative proportions in measured quantities as in parts per milli
9.
Fluoride-in-water meas.
10.
Concentration amt.
11.
EPA meas.
12.
[See note]
13.
Printer ad abbr.
14.
Pollution meas.
15.
EPA pollutant concentration meas.
16.
Air-pollution meas.
17.
Printer speed meas.
18.
Air-pollution measurement (abbr.)
19.
Unit used in describing the amount of a toxin in drinking water (abbr.)
20.
Printing speed
21.
Parts per mil.
22.
Measure of concentration: Abbr.