installation of an electrostatic pre cipitator (ESP – a.k.a. electrostatic air cleaner) for particulate abatement, which already during tially reduced specific emissions by about 70% compared with pre-in vestment conditions; substitution of the 9 oil/gas burners present in the boiler with low-NOx burners, which has permitted tangible environmental improvement in all op erating conditions envisaged; use of a new fuel-oil feed system; modernization of the instrument & control system.