Environmental

In Kansas, the primary indoor air quality concern in post-1980 'tight' energy-efficient homes is:

AIncreased radon concentrations due to reduced air infiltration and increased occupant exposure✓ Correct
BCarbon monoxide from more efficient heating systems
CLead paint off-gassing from sealed surfaces
DFormaldehyde from concrete slab foundations

Explanation

Energy-efficient homes with reduced air infiltration can trap radon gas inside, leading to higher indoor concentrations than in older, leakier homes — making radon testing particularly important in well-sealed newer homes.

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