There is no European Environmental Directive for odour levels in ambient air. This is a serious issue that affects not only the European Citizens who have to deal with odour annoyance in their environment but also the European Industries, who need a clear framework to develop and manage their activities.
In March 2017, academics from Poland sent a petition to the European Parliament, signed by a wide group of odour experts from across Europe. A couple of years later the Commission replied that they do "not intend to propose any additional specific requirements regulating odour nuisances"
Unfortunately, odours in Europe continue to be outside of the planning procedures except in some countries.