Collaborative environmental management (CEM)

The Collaborative Environmental Management (CEM) concept has been  developed to  meet the needs, expressed by stakeholders, to find common solutions to the environmental challenges they face at and around their airports resulting from their combined operations

A need was identified for a generic process that brings together key operational stakeholders at airports (airport operators, aircraft operators and air navigation service providers) through a working arrangement adaptable to local conditions and requirements.  The resulting CEM Working Arrangement requirements were set out in the CEM Protocol (Chapter 7) of the EUROCONTROL CEM Specification published in September 2014 following a public consultation process involving stakeholders across the entire European aviation sector. 

Since then, the environmental challenges around airports, together with a return to strong traffic growth have increased the pressure on all stakeholders and made the management of these issues a critical priority.

In this context, the CEM Specification has been reviewed to ensure that its meets the needs of today’s aviation sector.   Articulated in a practical protocol adaptable to locals need, the CEM working arrangement provides a platform for discussion and allows core operational stakeholders to identify synergies, quantify impacts and reach compromises from an operational environmental perspective.

In addition, the collaborative approach of the CEM working arrangement can support the search for solutions that ensure the maximum potential for current operations and the sustainable growth of the airport.



CEM Online

The purpose of CEM Online is to provide a common platform to assist key operational stakeholders at airports in setting up a CEM Working Arrangement and to demonstrate compliance with the CEM Specification’s Requirements.

Stakeholders will be able to manage access to their own secure workspace and to document needs and actions under each Requirement. Each CEM Working Arrangement is unique and information can be accessed only by its members.

Functionalities include a dashboard option that can display compliance levels and monitor progress. Filtering and print options provide opportunities to download customised reports.

The platform may also provide support to stakeholders who need to provide evidence to respond to voluntary carbon-reduction programmes, environmental certification schemes or to meet environmental legislative reporting requirements.


To access the tool you first need to register for the OneSky Online portal. 


If you are already registered, please fill in this form to be given access.


If you have received confirmation from the CEM Team that your account has been configured, you can log in to OneSky Online and access the tool.