medium · LSAT Logical Reasoning
A city reported its highest-ever industrial output last year, with local factories operating at near-maximum capacity. Surprisingly, air quality monitors throughout the city showed that the levels of harmful pollutants were significantly lower than in previous years of lower industrial activity.
Which one of the following, if true, most helps to resolve the paradox?
- The city had just imposed stringent environmental rules compelling every major factory to fit advanced filtration equipment and switch to cleaner-burning fuels.
- The city's overall population has fallen sharply as many longtime residents moved out to quieter suburbs to escape the noise generated by the local factories.
- Unusually persistent and strong seasonal winds that year repeatedly kept airborne pollutants from settling and lingering for long over the city's neighborhoods.
- The city's air-quality monitors are frequently sited in residential neighborhoods rather than directly beside the heavy-emitting industrial zones near the river.
- Total emissions per ton of finished goods produced have stayed roughly constant across nearly all of the city's many factories for a great many years.
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