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Exercise V. One in a Million07-16-2008

Substances in water are often measured in parts per million (ppm), parts per billion (ppb), or even parts per trillion (ppt ...

http://www.epa.gov/owow/nps/nps_edu/boatx5.html (HTML)

ECOTOX | MED | US EPA06-24-2009

1 X 10 +3 (counts per minute RNA per milligram TCA) per milligra... counts per minute RNA per milligram RNA) per milligram DNA.

http://cfpub.epa.gov/ecotox/help.cfm?help_id=ConcDose%26help_type=defi... (HTML)

ECOTOX | MED | US EPA06-24-2009

1 X 10 +3 (counts per minute RNA per milligram TCA) per milligra... counts per minute RNA per milligram RNA) per milligram DNA.

http://cfpub.epa.gov/ecotox/help.cfm?help_id=OBSRESPONSE%26help_type=d... (HTML)

ECOTOX | MED | US EPA06-24-2009

1 X 10 +3 (counts per minute RNA per milligram TCA) per milligra... counts per minute RNA per milligram RNA) per milligram DNA.

http://cfpub.epa.gov/ecotox/help.cfm?help_id=ApplRate%26help_type=defi... (HTML)

EPA - Air Toxics Website - Organic Hazardous Air Pollutants for Equipment Leaks11-09-2007

i) For Phase I, an instrument reading of 10,000 parts per million or greater. ii) For Phase II, an instrument reading of 5,000 parts per million or greater.

http://www.epa.gov/ttn/uatw/petrefine/guide/63.16.html (HTML)

PART 50-NATIONAL PRIMARY AND SECONDARY AMBIENT AIR QUALITY STANDARDS | Green Book | US EPA01-06-2010

2) 35 parts per million (40 milligrams per cubic meter) for a 1- hour average concentration not to be exceeded more than once per year ...

http://www.epa.gov/air/oaqps/greenbk/40cfr50.html (HTML)

Superfund for Students and Teachers | Superfund | US EPA06-03-2009

Part A is intended to gauge the students' intuitive grasp of how small a "part-per-million" and a "part-per-billion"" are ...

http://www.epa.gov/superfund/students/clas_act/haz-ed/numbers.htm (HTML)

One in a Million | Superfund | US EPA06-03-2009

... the concept of a pollutant's having a certain concentration in parts per million of treated water... Explain that cup 1 is 100% mouthwash (a million parts per million.

http://www.epa.gov/superfund/students/clas_act/spring/onemil.htm (HTML)

EPA - TTN NAAQS - Ozone - RTO - Resource List - PART 50-NATIONAL PRIMARY AND SECONDARY AMBIENT AIR QUALITY STANDARDS03-04-2008

b) The level of the 24-hour standard is 0.14 parts per million (ppm), not to be exceeded more than once per calendar year ...

http://www.epa.gov/ttn/naaqs/ozone/rto/ozonetech/40cfr50.htm (HTML)

EPA - TTN NAAQS - Ozone Implementation - Technical Resources - PART 50-NATIONAL PRIMARY AND SECONDARY AMBIENT AIR QUALITY STANDARDS11-19-2007

b) The level of the 24-hour standard is 0.14 parts per million (ppm), not to be exceeded more than once per calendar year ...

http://www.epa.gov/ttn/naaqs/ozone/ozonetech/40cfr50.htm (HTML)

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