A lot depends of Contaminate gases also in the NG. Wells in IL have a great deal of Sulphur, nasty to remove so those stay capped as also Corrosive as hell.
Almost sorry stirred hornets nest, then again Not! See no value in a system that credits Typical Reduction at less than 15% and Best attainable at 25%, where costs excessively, uses fuel to make function as cannot on its own, and chokes itself up on the crap supposed to "Destroy" that never has. Costs are transferred Trickle Down back to anyone as Consumer.
Spent 25 years around Diesels full time, Winter shop atmosphere a Cloud of gray/blue haze. Black Boogers, smell of diesel on and in me for hours after left. HOWEVER, Smoked like a Forest Fire, Marlboros or Camels from 2-5 packs Daily drank coffee from open cup sitting on toolbox, ate lunch in same area. Nose filtered out much of the particulate, and much of that Oil not fuel. Driptroits, OLD Series Low Compression Cummins or Cats. A LOT of Hard Smokers like Mack and so far made it to 69. Great Uncle hauled water for Steamers on Thrashing machines, then to Brakeman and stoker on Pennsy RR, another Great Uncle worked switch yards as Standard Oil, Asbestos dust, raw oil fumes, Coal ash and Smoke, we even had Coal Furnace in house until was six, played in Coal Bunker. Those two older men lived into late 80s, Dad and Uncle (His Brother) worked A&E after WWII, Bathed in RAW Gas to get oil off, washed Lye soap to get gas off, Unc died 93, Dad at 83, both around Av Gas, Asbestos Brakes, Hydraulic Oils, Asbestos Blanket insulation and even Home Siding. So I can say I appreciate Cleaner air, just not ever had much of it and not exactly killed me yet. Still Weld, Still Gas Axe, still end up black boogers, probably will until last days capable.
