The Regional Prefect shall adopt the provisions necessary to implement the national plan for the prevention of health risks linked to the environment after examining the joint proposals of the Director General of the Regional Health Agency and the Regional Director for the Environment, Planning and Housing. For matters falling within the remit of the Regional Health Agency as defined in articles L. 1431-1 and L. 1431-2, the project approved by the Regional Prefect includes the actions defined by the Director General of the Regional Health Agency.