Staying Safe in a Toxic World
Picturing A Part Per Million (ppm) Statistics for Action
Our results show arsenic in the drinking water.
How much? The EPA stan- dard is only 0.010 ppm.
Uh oh. We found 0.10 ppm. That’s 10 times the EPA standard.
But what is a part per million (ppm)? Is it like a drop of ink in...
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More ways to picture a part per million:
One inch in 16 miles
About one minute in two years
One penny in $10,000.
Read “Water is Precious” by Luis Costa at <
www.nelrc.org/changeagent/extras>. 26 The Change Agent — March 2011
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Extra!
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