Automatic gas chromatograph (auto-GCs) manufacturers perform an experimental method for a simple, rapid, and low-cost detection limit evaluation for volatile organic compounds in ambient air. The principle is the estimation of a minimum area of a peak. It is a relevant area value that discerns a real peak from the ground noise. This experimental limit of detection is equal to the minimum area unit multiplied by a known ratio concentration or area unit defined after calibration. Three different international methods have been compared with this experimental method: the calibration curve method issued in Europe for Monitoring Certification Scheme, the method detection limit issued during a gas chromatograph evaluation study organized by the U.S. Environmental Protection Agency, and a third international method based on an approach by the use of background noise. The exploitation of the different results concludes that this experimental method gives values in the same order of magnitude as the other methods. This experimental approach is concrete and beneficial for the improvement of auto-GCs: less ground noise, more sample volume trapped, and increase in the value area unit or mass injected.