Is methane classified as poisonous?

Methane is not classified as poisonous in the traditional sense. While it is a simple hydrocarbon that is non-toxic and does not have harmful effects in low concentrations, it can indeed act as a narcotic at very high concentrations. In environments where methane accumulates, high levels can displace oxygen, leading to asphyxiation rather than direct poisoning. This is an important distinction because it highlights the necessity of adequate ventilation and safety measures in areas where methane is present.

In contrast, saying that methane is extremely poisonous or becomes deadly at low concentrations would be misleading, as it does not exhibit toxicological properties typical of substances that are classified as poisonous. Additionally, while methane is flammable and poses explosion risks, classifying it as completely safe in all concentrations disregards the potential hazards associated with high levels of methane, particularly in enclosed or poorly ventilated spaces.