Coal breaker remaining. The sorting by size is particularly important for anthracite coal. In order to burn efficiently, air must flow evenly around anthracite. Subsequently, most anthracite coal is sold in uniform sizes. In the 1910s, there were six commercial sizes of coal (with the smallest size having three subsets): Coal pieces smaller than in size were considered "culm," and unable to be separated from the impurities (and thus useless). The grade of coal ranged from a low of 5 percent impurities for steam or broken coal to a high of 15 percent for pea-size coal and its subsets. Coal breakers were
Coal in Europe in coal mines, caused by the liberation of methane from mining. Annual coal carbon emissions (2005–2008 average) were highest per capita in Europe in Czech Republic 7.4, Kazakhstan 6.9, Poland 5.5, Finland 4.8, Serbia 4.5 and Germany 4.1. Coal in Europe Coal production in Europe is falling, and imports exceed production. There is, however, growing controversy in Europe over the use of coal, as many denounce it for reasons such as health risks and links to global warming. International Energy Agency reports data for EU28 countries since 1990. According to IEA, EU28 countries use of coal as fuel has went