A facility experienced a "process upset" on Wednesday evening, resulting in a large plume of black smoke. The smoke was visible for miles, indicating a significant release. Details of the incident are limited, but it is known that the event occurred at a facility.

Further information about the incident can be found through the source. The smoke was described as a huge plume, and it was black in color. The incident occurred on a Wednesday evening, and the smoke could be seen from a distance, suggesting it was a substantial release of smoke into the air.