Potential advantage of measurable limits
Clear numeric standards, baseline measurements, continuous or periodic monitoring, and enforceable corrective procedures can make quality-of-life commitments testable.
Potential risk of an incomplete standard
A single property-line number without frequency, time, location, measurement, and enforcement details can leave important offsite effects unresolved.
The verification question
Verification requires comparing modeled receptor levels and photometric plans with baseline conditions, enacted limits, monitoring data, and complaint outcomes.