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In 1986, the city of Los Diablos had 20 days on which air [#permalink]
27 Sep 2005, 11:11
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In 1986, the city of Los Diablos had 20 days on which air pollution reached unhealthful amounts and a smog alert was put into effect. In early 1987, new air pollution control measures were enacted, but the city had smog alerts on 31 days that year and on 39 days the following year. In 1989, however, the number of smog alerts in Los Diablos dropped to sixteen. The main air pollutants in Los Diablos are ozone and carbon monoxide, and since 1986 the levels of both have been monitored by gas spectrography.
Which of the following statements, assuming that each is true, would be LEAST helpful in explaining the air pollution levels in Los Diablos between 1986 and 1989?
(A) The 1987 air pollution control measures enacted in Los Diablos were put into effect in November of 1988.
(B) In December of 1988 a new and far more accurate gas spectrometer was invented.
(C) In February of 1989, the Pollution Control Board of Los Diablos revised the scale used to determine the amount of air pollution considered unhealthful.
(D) In 1988 the mayor of Los Diablos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures.
(E) Excess ozone and carbon monoxide require a minimum of two years to break down naturally in the atmosphere above a given area.
PLEASE LET US KNOW HOW YOU PICK YOUR ANSWER AND YOUR LINE OF REASONING. THANKS
Even though industries are exempted from air pollution control measures, it does not mean industries will release less pollutants. Therefore, it can not explain why the number of smog alerts in Los Diablos dropped from previous years.
The best choice is B. B is the only one that could not explain why the number of cases went up in 1988 to 39, and then dropped in 1989 to 16. If the new gas spectograph resulted in a more stringent test, then in 1988, the number of smog alerts should have shown a decline compared to 1987. If the new gas spectograph was relaxed, then we can't explain why in 1989 the number of smog alerts went down compared to 1988.
D is not good. It explains fully when 1988 had more smog alerts compared to 1987, and it also provides an explanation why 1989 showed a massive decline compared to 1988 and 1987.