EPA Air · stack tests by county and year

Air-emissions stack tests in Yellowstone County, Montana, 2019

86Stack tests

A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Yellowstone County, Montana during 2019. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Yellowstone County facility page.

Yellowstone County, Montana, 2019

Air-emissions stack tests in Yellowstone County, other years

Air-emissions stack tests recorded in Yellowstone County, Montana, 2019

Date	Facility	Kind	Agency
2019-12-16	BILLINGS REFINERY	Pass	State
2019-12-16	BILLINGS REFINERY	Pass	State
2019-12-16	BILLINGS REFINERY	Pass	State
2019-12-16	BILLINGS REFINERY	Pass	State
2019-12-16	BILLINGS REFINERY	Pass	State
2019-12-16	BILLINGS REFINERY	Pass	State
2019-12-16	BILLINGS REFINERY	Pass	State
2019-12-16	BILLINGS REFINERY	Pass	State
2019-12-16	BILLINGS REFINERY	Pass	State
2019-12-16	BILLINGS REFINERY	Pass	State
2019-12-16	BILLINGS REFINERY	Pass	State
2019-12-16	BILLINGS REFINERY	Pass	State
2019-12-16	BILLINGS REFINERY	Pass	State
2019-12-03	PAR MONTANA BILLINGS REFINERY	Pass	State
2019-12-02	BILLINGS REFINERY	Pass	State
2019-11-04	CHS INC REFINERY LAUREL	Pass	State
2019-11-04	CHS INC REFINERY LAUREL	Pass	State
2019-10-16	BILLINGS REFINERY	Fail	State
2019-10-14	WESTERN SUGAR COOPERATIVE — high-priority violation on file	Pass	State
2019-10-09	YELLOWSTONE POWER PLANT — high-priority violation on file	Pass	State
2019-10-08	PAR MONTANA BILLINGS REFINERY	Pass	State
2019-09-30	CHS INC REFINERY LAUREL	Pass	State
2019-09-30	CHS INC REFINERY LAUREL	Pass	State
2019-09-30	CHS INC REFINERY LAUREL	Pass	State
2019-09-25	CHS INC REFINERY LAUREL	Pass	State
2019-09-25	CHS INC REFINERY LAUREL	Pass	State
2019-09-06	YELLOWSTONE POWER PLANT — high-priority violation on file	Pass	State
2019-09-06	YELLOWSTONE POWER PLANT — high-priority violation on file	Pass	State
2019-08-08	CHS INC REFINERY LAUREL	Pass	State
2019-07-30	CHS INC REFINERY LAUREL	Pass	State
2019-07-30	CHS INC REFINERY LAUREL	Pass	State
2019-07-30	CHS INC REFINERY LAUREL	Pass	State
2019-07-30	CHS INC REFINERY LAUREL	Pass	State
2019-07-28	BILLINGS REFINERY	Pass	State
2019-07-12	CHS INC REFINERY LAUREL	Pass	State
2019-07-12	CHS INC REFINERY LAUREL	Pass	State
2019-07-12	CHS INC REFINERY LAUREL	Pass	State
2019-07-12	CHS INC REFINERY LAUREL	Pass	State
2019-07-12	CHS INC REFINERY LAUREL	Pass	State
2019-07-12	CHS INC REFINERY LAUREL	Pass	State
2019-07-12	CHS INC REFINERY LAUREL	Pass	State
2019-07-12	CHS INC REFINERY LAUREL	Pass	State
2019-07-10	BILLINGS REFINERY	Pass	State
2019-07-10	BILLINGS REFINERY	Pass	State
2019-07-10	YELLOWSTONE POWER PLANT — high-priority violation on file	Pass	State
2019-07-01	CHS INC REFINERY LAUREL	Pass	State
2019-07-01	CHS INC REFINERY LAUREL	Pass	State
2019-07-01	CHS INC REFINERY LAUREL	Pass	State
2019-07-01	CHS INC REFINERY LAUREL	Pass	State
2019-07-01	CHS INC REFINERY LAUREL	Pass	State
2019-07-01	CHS INC REFINERY LAUREL	Pass	State
2019-07-01	CHS INC REFINERY LAUREL	Pass	State
2019-07-01	CHS INC REFINERY LAUREL	Pass	State
2019-06-28	PAR MONTANA BILLINGS REFINERY	Pass	State
2019-06-28	PAR MONTANA BILLINGS REFINERY	Pass	State
2019-06-28	PAR MONTANA BILLINGS REFINERY	Pass	State
2019-06-05	CHS INC REFINERY LAUREL	Pass	State
2019-06-05	CHS INC REFINERY LAUREL	Pass	State
2019-06-05	CHS INC REFINERY LAUREL	Pass	State
2019-06-05	CHS INC REFINERY LAUREL	Pass	State
2019-06-05	CHS INC REFINERY LAUREL	Pass	State
2019-06-05	CHS INC REFINERY LAUREL	Pass	State
2019-06-05	CHS INC REFINERY LAUREL	Pass	State
2019-06-05	CHS INC REFINERY LAUREL	Pass	State
2019-06-05	CHS INC REFINERY LAUREL	Pass	State
2019-05-28	BILLINGS REFINERY	Pass	State
2019-05-28	BILLINGS REFINERY	Pass	State
2019-05-13	YELLOWSTONE POWER PLANT — high-priority violation on file	Pass	State
2019-05-10	YELLOWSTONE POWER PLANT — high-priority violation on file	Pass	State
2019-05-06	CHS INC REFINERY LAUREL	Pass	State
2019-05-06	CHS INC REFINERY LAUREL	Pass	State
2019-05-06	CHS INC REFINERY LAUREL	Pass	State
2019-05-06	CHS INC REFINERY LAUREL	Pass	State
2019-05-06	CHS INC REFINERY LAUREL	Pass	State
2019-05-06	CHS INC REFINERY LAUREL	Pass	State
2019-05-06	CHS INC REFINERY LAUREL	Pass	State
2019-05-06	CHS INC REFINERY LAUREL	Pass	State
2019-03-19	BILLINGS REFINERY	Fail	State
2019-03-19	BILLINGS REFINERY	Fail	State
2019-03-19	BILLINGS REFINERY	Fail	State
2019-03-01	CHS INC REFINERY LAUREL	Pass	State
2019-02-25	WESTERN SUGAR COOPERATIVE — high-priority violation on file	Pass	State
2019-01-31	BILLINGS REFINERY	Pass	State
2019-01-31	YELLOWSTONE POWER PLANT — high-priority violation on file	Pass	State
2019-01-18	MONTANA SULPHUR & CHEMICAL	Pass	State
2019-01-14	WESTERN SUGAR COOPERATIVE — high-priority violation on file	Pass	State

Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.