diff --git a/pygeoapi/api/environmental_data_retrieval.py b/pygeoapi/api/environmental_data_retrieval.py
index a72b976..8bbb242 100644
--- a/pygeoapi/api/environmental_data_retrieval.py
+++ b/pygeoapi/api/environmental_data_retrieval.py
@@ -341,7 +341,6 @@ def get_oas_30(cfg: dict, locale: str) -> tuple[list[dict[str, str]], dict[str,
                             {'$ref': f"{OPENAPI_YAML['oaedr']}/parameters/locationId.yaml"},  # noqa
                             {'$ref': f"{OPENAPI_YAML['oapif-1']}#/components/parameters/datetime"},  # noqa
                             {'$ref': f"{OPENAPI_YAML['oaedr']}/parameters/parameter-name.yaml"},  # noqa
-                            {'$ref': f"{OPENAPI_YAML['oaedr']}/parameters/z.yaml"},  # noqa
                             {'$ref': '#/components/parameters/f'}
                         ],
                         'responses': {