In The China Environment Yearbook, Volume 4 | ISBN: 9789004182417
Atmospheric brown clouds (棕色云团) (ABCs): A cloud-shaped mixture of pollutants consisting primarily of fine particles, including carbon and organic particles, sulfates, nitrates, ammonium salts, sand, and dust in the troposphere.
ABCs have the same atmospheric condition as hazes do. However, hazes may affect only a particular city, while ABCs may envelop broader regions. Brown clouds called Asian brown clouds have appeared above the Indian Ocean, South Asia, Southeast Asia, and Southern China.
Blue-green algae bl…