Although industrialized countries still account for the bulk of environmental pollution, emissions generated in developing countries have significantly increased over the last years. A recent report of the International Energy Agency (IEA) states that carbon dioxide (CO2) emissions by developing countries increased at a much faster rate than CO2 emissions by industrialized countries.1 The implications from this increase in pollution are mostly visible in major cities of developing countries. The most prominent example is probably Beijing, which, despite tremendous efforts to reduce air pollution during the 2008 Olympic Games, is again fighting hard to improve its bad air quality.2 Interestingly, however, there also exist examples such as Thailand’s capital, Bangkok, which managed to improve its air quality.3