The Source Testing Association (STA) is a non-profit making technical trade association which was established in 1995 and has a corporate membership of over 200 companies from process operators, regulators, equipment suppliers and test laboratories. The STA is committed to the advancement of the science and practice of emission monitoring and to develop and maintain a high quality of service to customers. Aims and objectives: contribute to the development of industry standards, codes, safety procedures and operating principles; encourage the personal and professional development of practising source testers and students; maintain a body of current sampling knowledge; assist in maintenance of a high level of ethical conduct; seek co-operative endeavours with other professional organisations, institutions and regulatory bodies, nationally and internationally, that are engaged in source emissions testing.