Which of the following is present in the atmosphere?

The correct answer is: All of these

The correct option is d)All of these.

• Airborne dust particles, often referred to as particulate matter (PM), come from a variety of sources. Both size and chemical composition vary greatly in relation to source nature and particle history.
• The study of pollen and spores is known as palynology. Pollen is produced in such quantities that it is an integral part of the airborne component of the Earth's atmosphere, especially in continental regions.
• The amount of water vapor in the atmosphere is called humidity. Relative humidity is a measure of current humidity for a given temperature.