“Clean Air for Smaller Cities in the ASEAN Region” (CASC) was implemented from 2009–2015. Because the project is no longer active, this website will no longer be maintained. The documents and other materials included here will remain available until mid-2017.

The partner cities and organisations that made CASC a success continue their work on protecting air quality, and they are not alone: the ASEAN-German Technical Cooperation Programme “Cities, Environment and Transport” (CET) continues to support reduced emissions from transport and industry, along with the co-benefits to local populations and the natural environment that these efforts bring. Learn more about CET here.


Please find our “Handbook for Clean Air Management in Smaller Cities“: It was developed with support from Clean Air Asia, details key steps to enable smaller cities to implement air quality management measures to curb health and environmental impacts of air pollution, anticipating that as they move towards the same growth trajectory as megacities in the region, smaller cities will likewise experience similar challenges in air quality management. The publication reinforces the urgency for improved air quality management to be on the development agenda, particularly in smaller cities that often lack the financial capacity to fund the necessary initiatives.

Other publications and documents:

The following documents include background information on the project ‘Clean Air for Smaller Cities’, the appraisal report as well as annual reports to our counterpart ASEAN.

Cities’ Selection Criteria: In the project’s beginning, criteria for city selection were developed and consequently approved by the ASEAN Secretariat. The criteria represented a guideline for the national counterparts to select the participating cities. The candidate cities were required to present city information according to the guideline in order to become a project partner city.

Country Profiles: The reports provide background information on the state of air quality management, the legal framework and relevant stakeholders with a focus on cities.

Road Maps: The Road Map outline the steps towards Clean Air Plans for the project’s partner cities.

National Workshop Reports: Together with national counterparts, the project organizes national workshops on various topics regarding air quality management and Clean Air Planning.

Reports from events in partner cities

Due to data sensitivity, only a selected number of emission inventory reports and Clean Air Plans are available publicly.

Best Practices: Based on the experiences of CASC partners, a number of best practices have been identified that can help other cities engage in successful clean air planning.