Yonker first dipped its toe into the en-vironmental protection waters in 2004,starting by tackling flue gas discharges.In 2005 it began to specialize in fluegas desulfurization for coal-fired powerstations. The next year it expanded intodesulfurization at iron and steel plants.In 2oo7 it bifurcated its services intodenitrification and launched a consultingbranch.