Which of the following statements are true about aerosols in the atmosphere?

A. Aerosols include sea salts, fine soil, smoke, pollens, soot.

B. Aerosols in the air contribute to the various hues of red and orange at sunrise and sunset.

C. The concentration of aerosols is maximum in mesosphere.

D. Aerosols act as surfaces on which water vapour condenses.

Choose the correct answer from the options given below: