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... 

AB  

C

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 &#60;www.nelrc.org/changeagent/extras&#62;. 26 The Change Agent — March 2011

D

 

Extra!

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