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In 1986, the city of Los Diablos had 20 days on which air [#permalink]
14 Jul 2005, 13:51
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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.
Last edited by cybera on 19 Jul 2005, 16:51, edited 1 time in total.
IMO, (B) has the same value as (D).
(B) may mean, that with the invention of new spectometer it became possible to measure the level of pollution more accurately. It also implies, that previous spectometers' measure were incorrect, and it became obvious only with the new spectometer that correctly measured the level of pollution soon after it's invention.
As for (D),
We may also assume, that after mayor was found to have exempted some industries from measure controls, he was made to cancel exemptions, thus decreasing the level of pollution in the next year. However, there is no evidence of whether or not he changed his policy toward those industries.