Coal mines existed plenty some years back, but most people who worked in the mines had little to no option when it came to air quality.
When they went home, their standards for indoor air quality were low, they could clean the soot off their skin however not the one in their lungs.
My Grandfather Gerald was easily young when his father worked in the mines, he later died of a respiratory-related ailment. When my Grandfather was seasoned enough to work, he made sure he found labor far from the mines. He later got into the Heating, Ventilation, and A/C business; Good indoor air quality was vital to him. My mother followed in his footsteps and became an Heating, Ventilation, and A/C professional, however it became a family tradition that every home among his five children had a whole-house media air cleaner. They all had a smart Heating, Ventilation, and A/C with suitable air purification help and a unusual media air cleaner, all upon their father’s insistence. The reason he got into the house repair business was so that he could ensure air purification through Heating, Ventilation, and A/C component in as many homes as he could. I also have an aunt who is an Heating, Ventilation, and A/C contractor, and together with my mother, they took over the family business after my Grandfather retired, then everybody with Gerald as a family relation can comfortably replace an air filter; my associate and I have come to refer to it as a right of passage. Gerald will randomly call to ask about the last time you had duct cleaning done in your home. The best part is that they visit all of us often, and my associate and I all argument about who will host him and his Grandma in our home. They say it’s a exhausting habit, however deep down, my associate and I know they care about it.