Parts Per Billion

The Childhood Lead Poisoning Prevention Program is committed to the Healthy People goal of eliminating elevated blood lead levels in children by 2020. CDC continues ...

Gases typically measured in parts per million (ppm), parts per billion (ppb) or parts per trillion (ppt) are presented separately to facilitate comparison ...

Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes, and ...

Australia: First 4 Billion Years. One of the strangest landscapes on Earth reveals our planet's complex history. Airing July 16, 2014 at 9 ...

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