Water pollution is less if \( B O D \) is (A) less than \( 5 \mathrm{ppm} \) (B) less than \( 15...
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0Water pollution is less if \( B O D \) is
(A) less than \( 5 \mathrm{ppm} \)
(B) less than \( 15 \mathrm{ppm} \)
(C) less than \( 50 \mathrm{ppm} \)
(D) less than \( 100 \mathrm{ppm} \).
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