What is a common indication of a gas leak in a residence?

The common indication of a gas leak in a residence is a rotten egg smell due to the added odorant. Natural gas is odorless in its original state, so utility companies add a sulfur-containing compound called mercaptan to give it a distinctive smell that is easily recognizable. This pungent odor serves as a critical safety feature, allowing occupants to detect a gas leak quickly and take appropriate action, such as evacuating the area and contacting emergency services.

While the other options might suggest various issues or symptoms related to gas exposure or leaks, they do not pinpoint the common, specific indication utilized for identifying gas leaks in residential settings. The rotten egg smell is an intentional safety measure, making it the most reliable indicator for individuals to recognize a potentially dangerous situation involving gas.