I always edit my posts for the first few minutes to try and correct spelling mistakes etc, so you should not comment for about a few minutes.
Sometimes I do to self moderate my posts so as to not provoke anyone, as that is not my intention.
aah regarding sniffing equipment, there are various types including ones that hear high pitch which they are sensitive to , others have a gas analyser.
Ultrasonic Detectors
Ultrasonic gas detectors use acoustic sensors to detect changes in the background noise of its environment. Since most gas leaks occur in the ultrasonic range of 25 kHz to 10 MHz, the sensors are able to easily distinguish these frequencies from background noise which occurs in the audible range of 20 Hz to 20 kHz.[12] The ultrasonic gas leak detector then produces an alarm when there is an ultrasonic deviation from the normal condition of background noise. Despite the fact that Ultrasonic gas leak detectors don’t measure gas concentration, the device is still able to determine the leak rate of an escaping gas.[13] By measuring its ultrasonic sound level, the detector is able to determine the leak rate, which depends on the gas pressure and size of the leak. The bigger the leak, the larger its ultrasonic sound level will be.