The 4th Environmental Technology exhibition and conference -ET94 - is taking place 22 - 24 March at the National Exhibition Centre, Birmingham, UK. More than 350 exhibitors -substantially up on the previous events -will be on hand to discuss problems relating to environmental pollution, and to offer an enormous variety of technological solutions. There is also a series of 40 Expert Briefings, which will take the form of tightly focused 90-minute presentations by leading figures and workers in the environmental technology field. These will include briefings on securing Integrated Pollution Control authorisations, biotreatment of industrial effluent, affordable control of gas emissions, monitoring volatile organic compounds, final polishing in effluent treatment, options in particulate removal, an update of air emissions monitoring, profitable innovations for clean technology, incineration for waste disposal, and many other key topics in environmental pollution. The following represents a selection of the companies showing products of particular relevance to filtration and separation engineers.