Wiktionary
n. A form of atmospheric pollution that is a mixture of aerosols, that absorb and scatter light, that results from the burning of biomass and fossil fuel
Usage examples of "brown cloud".
A rusty pickup truck materialized out of the brown cloud that had whirled up the dirt road like a dust devil and rattled to a stop in front of the veranda.
She was sailing backwards over the orange-brown cloud-sea of Titan.
The orange and brown cloud stretched to the limits of east and west, turning the sun an apocalyptic flame red.
On the third day a black-brown cloud loomed out of the west, stabbing the sea with lightning.
The sound the brown cloud made had become a little louder, but was still far away and indefinable.
He had no sooner spoken the words than the Golden Marlin struck the sea floor with loud creaking and groaning sounds of protest, as her hull settled into the silt, throwing up a vast brown cloud that blotted out all vision beyond the view ports.
The brown cloud had spread over the lowlands like a thick, filthy sea that flowed almost to the forest slopes at their feet.
Alone in that empty, invisible sky, she fought off strange illusions that seemed to bloom out of the surrounding brown cloud.
He turned his face into a clammy breeze and stared down the length of a short, fat canal to discover a low brown cloud obscuring the horizon.
Mansur was astonished by its length as it floated over her shoulders in a dense honey-brown cloud, thick and lustrous in the soft evening sunlight.
Dirk shut off the thrusters and waited for the brown cloud to settle.