Three Facilities, One Complaint. Whose Is It?

How real-time mobile monitoring identifies which facility caused an odor

An odor complaint arrives at a regulator. Somewhere in an industrial corridor, a resident reports a smell. An inspector is dispatched. By the time that inspector arrives, often several hours later, the wind has shifted, and the odor is gone. The report notes that the source could not be confirmed.

The facility stays under suspicion. The resident stays unsatisfied. And nothing is resolved because no measurements were taken. This is not a failure of diligence. It is a structural mismatch. Odor events are transient and sometimes not evident during the first or subsequent review. Odor events can last minutes. An investigation that starts hours later has nothing left to measure.

THE MULTI-FACILITY PROBLEM

It becomes harder when several facilities sit near each other, as is common in an industrial corridor. Each operator can honestly say the emission wasn't theirs because none have data showing otherwise. The regulator cannot assign responsibility without evidence. The facility with the most visible profile is often assumed responsible.

Being innocent is not the same as being able to demonstrate it.

WHAT CHANGES THE SITUATION

Two things have to be true at once. You have to be measuring while the event is happening, and you have to be able to move as you gather the samples. Measuring matters because the plume is the evidence, and it does not wait. Moving matters because a single fixed point gives you a concentration, and concentration alone doesn't tell you where something came from.

RJ Lee Group's mobile platform can take real-time measurements to characterize a plume's chemical composition at the complaint location, then characterize plumes from each candidate source and compare them.

HOW ATTRIBUTION WORKS

Every process produces a characteristic mixture. Not a single compound, but a pattern across many compounds at particular relative concentrations. That pattern is closer to a fingerprint than to a signature.

RJ Lee Group performs odor allocation using multivariate statistical analysis, specifically principal component analysis, in the Sartorius SIMCA package. Rather than asking whether a single compound is present, the analysis compares the whole pattern of a complaint-location sample against the patterns of each candidate source.

The result is a statistical match, not an assertion. The outcome matters because the audience for this work is frequently a regulator, a hearing, or opposing counsel.

WHAT THIS IS FOR

Facilities named in complaints they do not believe are theirs. Municipalities fielding citizen reports with no independent data. Attorneys on either side of a nuisance matter. And operators who would rather find their own fugitive emission than have a regulator find it for them. RJ Lee Group has completed multiple community and mapping studies across BTEX, hydrogen fluoride, ethylene oxide, and odor allocation.

If you are in a dispute about whose emissions these are, that question has an answer. It just has to be measured while it is happening.

Related reading: Pinpointing the Source of Benzene Emissions in Real Time