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The present primary standards for the six regulated pollutants seem adequate to protect the health of the public. Some of the standards do offer a greater degree of protection than some of the others. Until more data are available they should not be changed, up or down. There does seem to be a need to establish a 24 hr standard for NO/sub 2/. There are insufficient and inadequate data to establish a standard for sulfates at this time.
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Benjamin G. Ferris (1978) studied this question.
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