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

In Problems 61 and 62, express the given standard:
(A) In scientific notation
(B) In standard decimal notation
(C) As a percent

310 30 30 ppm = 1,000,000-106 3 x 10-5 = 0.00003 = 0.003%