Toxic gas refers to any gas that can cause harm to living organisms when inhaled or absorbed. These gases can result from industrial processes, vehicle emissions, or natural events like volcanic eruptions. Common examples include carbon monoxide, chlorine, and ammonia, which can lead to serious health issues or even death. Exposure to toxic gas can occur in various environments, including homes, workplaces, and outdoor areas. Safety measures, such as proper ventilation and the use of protective equipment, are essential to minimize risks. Awareness of potential sources and symptoms of exposure can help individuals stay safe from harmful effects.