Consider the following statements with reference to Atmospheric Brown Clouds (ABCs):
1. It includes a mixture of anthropogenic sulfate, black carbon, dust, and fly ash particles.
2. It is formed at higher altitudes in the atmosphere and do not exist in the layers near the earth’s surface.
3. The first observation of this phenomenon was made as part of the Indian Ocean Experiment (INDOEX).
Which of the statements given above is/are correct?