Unit of measurement based on number of particles.
1 The EPA says a concentration of five parts per billion is acceptable.
2 Note that micrograms per liter is the same thing as parts per billion .
3 My tap water sample was very close to five parts per billion TCE.
4 The spectrometers typically detect chemicals in the "low parts per billion " range.
5 The highest test results were at 11 parts per billion (ppb).
6 The European Union limits are 60 parts per billion .
7 Its mass is uncertain to 20 parts per billion .
8 But Formisano measured formaldehyde at 130 parts per billion .
9 The Ministry of Health (MOH) guideline for safe drinking water is 2 parts per billion .
10 In comparison, Earth's atmosphere contains roughly 1,700 parts per billion of methane.
11 The federal level as mandated by the Environmental Protection Agency (EPA) is 15 parts per billion .
12 The state's limit is one part per billion, below the federal government's limit of five parts per billion .
13 Canada's are 63 parts per billion .
14 The US standards, which allow up to 75 parts per billion , are a relic of the George Bush administration.
15 In the tainted bottles of Coke, these residues were present at levels of between five and seventeen parts per billion .
16 Of those, eight sites had lead readings above 100 parts per billion , according to a statement from Governor Rick Snyder's office.
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