a large number of smoke stacks coming out of a factory a plane flying through a cloudy sky with smoke coming out of a factory a plane flying over a smoke stack emitting smoke a large number of smoke stacks emitting smoke a large stack of smoke coming out of a factory a large number of smoke stacks coming out of a factory a plane flying through a cloudy sky with smoke coming out of the chimneys a plane flying over a factory with smoke coming out of the chimneys a large factory with smoke coming out of it a plane flying through a cloudy sky with smoke coming out of the chimneys a large stack of smoke coming out of a factory a plane flying over a smoke stack emitting smoke a large factory with a large stack of smoke coming out of it a large number of smoke stacks emitting smoke a large factory with smoke coming out of it a large factory with smoke coming out of it a large number of smoke stacks emitting smoke a large factory with smoke coming out of it a large number of smoke stacks coming out of a factory a large factory with a lot of smoke coming out of it a plane flying over a factory with smoke coming out of the chimneys a large stack of smoke coming out of a factory a plane flying through a cloudy sky with smoke coming out of the chimneys a large factory with smoke coming out of it a plane flying over a factory with smoke coming out of the chimneys a plane flying through a cloudy sky with smoke coming out of the chimneys a plane flying through a cloudy sky with smoke coming out of a chimney a plane flying over a smoke stack emitting smoke a large factory with smoke coming out of it a large number of smoke stacks coming out of a factory
A lone bird flying past a chemical plants smoke stacks. Large clouds of smoke are coming from factory pipes. Some smoke stacks are coming from a large pipe On a cloudy day a chimney is blowing out smoke.  Several smokestacks release a lot of smoke, partially obscuring a plane in the sky.