Water vapour is not pollutant because water vapour is a natural process

Explanation:
Water vapour is not considered a pollutant because it is a natural component of the Earth's atmosphere and is essential for various ecological processes. Here is a detailed explanation:
- Lead oxide: Lead oxide is a pollutant that is released into the environment through human activities such as industrial processes and the burning of fossil fuels. It is harmful to human health and can cause various health issues, including damage to the nervous system, kidney damage, and developmental issues in children.
- Sulphur dioxide: Sulphur dioxide is a pollutant that is mainly emitted from burning fossil fuels, particularly coal and oil. It contributes to the formation of acid rain, which can damage ecosystems, harm vegetation, and corrode buildings and infrastructure. Inhaling sulphur dioxide can also cause respiratory problems and worsen existing respiratory conditions.
- Water vapour: Water vapour is the gaseous form of water and is a natural component of the Earth's atmosphere. It is created through the evaporation of water from oceans, lakes, rivers, and other bodies of water. While excessive levels of humidity can have negative effects on human comfort and certain materials, water vapour itself is not considered a pollutant.
- Nitrogen oxide: Nitrogen oxide is a group of highly reactive gases that are produced by the burning of fossil fuels, as well as by certain biological and natural processes. Nitrogen oxide is a major contributor to air pollution, and it can react with other compounds in the atmosphere to form smog and contribute to the formation of acid rain. In high concentrations, it can also have harmful effects on human health, particularly respiratory issues.
In summary, among the given options, water vapour is not considered a pollutant.