I really like the smell of bituminous coal smoke. I find that when (in a hand-fired) first loaded it tends to have a stronger smell that is pleasing in small doses, when burning well for a few minuites and producing light black smoke the smell is much less noticable and a different, it's a bit "spicier". In a stoker, the only time i can notice any smell outside is when it's warm outside and it's just idling along. mabey i'm crazy, but i really do like the smell of bit coal smoke in the air, it reminds me of the UK and eastern europe; it seems much more tolerable than woodsmoke, it takes a MUCH higher concentration of coal-smoke before it bothers my eyes or throat, and the smell doesn't cling to you like woodsmoke does. Good bituminous coal smoke reminds me of a good islay single malt, anthracite reminds me of loch dhu.