EPA Air · stack tests by state and year

Air-emissions stack tests in Montana, 2021

220Stack tests

A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every stack test below was recorded against a source in Montana during 2021; one facility can appear more than once, because this is a record of what happened rather than a list of places.

Counties in Montana, 2021

Montana, other years

Air-emissions stack tests recorded in Montana, 2021

Date	Facility	Where	Kind	Agency
2021-01-12	ROCKY MOUNTAIN POWER	HARDIN, Big Horn, MT	Pass	State
2021-01-12	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2021-01-12	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2021-01-12	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2021-01-12	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2021-01-12	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2021-01-12	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2021-01-12	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2021-01-12	PAR MONTANA BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2021-01-11	DAVE GATES GENERATING STATION AT MILL CREEK	ANACONDA, Deer Lodge, MT	Pass	State
2021-01-11	DAVE GATES GENERATING STATION AT MILL CREEK	ANACONDA, Deer Lodge, MT	Pass	State
2021-01-11	DAVE GATES GENERATING STATION AT MILL CREEK	ANACONDA, Deer Lodge, MT	Pass	State
2021-01-11	DAVE GATES GENERATING STATION AT MILL CREEK	ANACONDA, Deer Lodge, MT	Pass	State
2021-01-11	DAVE GATES GENERATING STATION AT MILL CREEK	ANACONDA, Deer Lodge, MT	Pass	State
2021-01-11	DAVE GATES GENERATING STATION AT MILL CREEK	ANACONDA, Deer Lodge, MT	Pass	State
2021-01-08	WILLISTON BASIN - LITTLE BEAVER	BAKER, Fallon, MT	Pass	State
2021-01-06	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2021-01-05	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2021-01-05	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2021-01-05	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State

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