This report assesses conceptually and empirically the extent to which the stringency of environmental regulations drives international trade in environmental goods. Many of the measures governments adopt to address issues such as local air and water pollution or GHG emissions take the form of regulations that aim to change the behaviour of firms or households. Compliance by private actors with those regulations in turn generates a growing market for environmental goods and services that is increasingly international in scope as more countries tighten their environmental regulations. Regulatory stringency thus spurs the development of a market for a whole range of equipment specifically meant for preventing and abating pollution, with important implications for international trade in such equipment. The different indicators of regulatory stringency considered in the present analysis generally support the notion that the stringency of environmental regulations positively affects countries’ specialisation in environmental products, even when considering specific sectors such as solid-waste management or wastewater treatment. While increased trade in environmental products is not an end in itself, the environmental benefits this entails can contribute to global improvements in environmental quality. By increasing demand for environmental products and technologies, environmental policy can complement trade policy in supporting pollution-reduction efforts not just domestically, but also abroad.