Which of the following is NOT considered a pollutant?

In the context of environmental regulations and insurance terminology, pollutants are generally substances that can cause harm to the environment or human health. Smoke, water vapor, and chemicals are all substances that can be classified as pollutants in certain circumstances.

Smoke is produced from combustion processes and can lead to air quality issues, making it a pollutant. Water vapor, while a natural component of the atmosphere, can act as a greenhouse gas and contribute to climate-related impacts under certain conditions, although it is typically not classified as a harmful pollutant in the same context as others. Chemicals can include a wide range of substances that are often harmful contaminants.

Sunlight, on the other hand, is not considered a pollutant. It is a natural source of energy that is essential for life on Earth. Unlike the other options, sunlight does not have harmful effects in the context of environmental regulations or classifications of pollutants. It contributes positively to ecosystems and does not cause harm directly, making it distinctly different in purpose and impact compared to the other listed substances.