Chapter A.5, Problem 62E

Air pollution. Air quality standards establish maximum amounts of pollutants considered acceptable in the air. The amounts are frequently given in parts per million (ppm). A standard of 30 ppm also can be expressed as follows:

     $\begin{array}{c}30\text{ppm}=\frac{30}{1,000,000}=\frac{3\times 10}{{10}^6}\\ =3\times {10}^{-5}=0.00003=0.003\%\end{array}$

In Problems 61 and 62, express the given standard:

(A)    In scientific notation

(B)    In standard decimal notation

(C)    As a percent

62.    0.03 ppm, the standard for sulfur oxides, when averaged over a year