It seems like you're asking about the allowable concentration of vinyl chloride (C₂H₃Cl) in the atmosphere around a chemical plant. However, the provided information is incomplete and potentially incorrect:

* Units: "1.8106 gL" is not a standard unit for concentration. Concentration is typically expressed in units like:

* ppm (parts per million): This represents the number of molecules of vinyl chloride per million molecules of air.

* mg/m³ (milligrams per cubic meter): This represents the mass of vinyl chloride in a cubic meter of air.

* ppb (parts per billion): Similar to ppm, but represents a smaller concentration.

* Accuracy: It's unlikely that an allowable concentration would be so specific, down to the sixth decimal place.

To get a correct answer, you need to:

1. Clarify the unit of concentration: What does "gL" actually represent? Is it a typo for something like ppm, mg/m³, or something else?

2. Provide a source for the information: Where did you find this concentration limit? Different organizations and countries may have different standards.

Once you have the correct unit and source, I can help you understand the safety implications of this concentration limit.