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 large cities elsewhere in the region continue to suffer from very poor air quality.
- The city's resident population has roughly tripled in size since the 1996 baseline measurement.
- Automobile and truck exhaust emissions account for the clear majority of the city's air pollution.
- Several monitoring stations were relocated to noticeably less-trafficked areas back in 2015.
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