medium · LSAT Logical Reasoning
Our city's air quality is better today than it was thirty years ago. In 1996 there were 24 days recorded as 'hazardous air'; in 2026 there were only 4.
Which one of the following, if true, most seriously weakens the argument?
- In 2010 the city greatly relaxed the threshold a day must cross to be recorded as 'hazardous'.
- Several other cities in the region continue to suffer very poor air quality.
- The city's population has roughly tripled since 1996.
- Automobile emissions account for the majority of the city's air pollution.
- Air-quality monitoring stations were relocated to less-trafficked areas in 2015.
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