RESUMEN
In recent years, commercial air transport has increased considerably. However, the compositions and source profiles of volatile organic compounds (VOCs) emitted from aircraft are still not clear. In this study, the characteristics of VOCs (including oxygenated VOCs (OVOCs)) emitted from airport sources were measured at Shenzhen Bao'an International Airport. The results showed that the compositions and proportions of VOC species showed significant differences as the aircraft operating state changed. OVOCs were the dominant species and accounted for 63.17%, 58.44%, and 51.60% of the total VOC mass concentration during the taxiing, approach, and take-off stages. Propionaldehyde and acetone were the main OVOCs, and dichloromethane and 1,2-dichloroethane were the main halohydrocarbons. Propane had the highest proportion among all alkanes, while toluene and benzene were the predominant aromatic hydrocarbons. Compared with the source profiles of VOCs from construction machinery, the proportions of halogenated hydrocarbons and alkanes emitted from aircraft were significantly higher, as were those of propionaldehyde and acetone. OVOCs were still the dominant VOC species in aircraft emissions, and their calculated ozone formation potential (OFP) was much higher than that of other VOC species at all stages of aircraft operations. Acetone, propionaldehyde, formaldehyde, acetaldehyde, and ethylene were the greatest contributors to ozone production. This study comprehensively measured the distribution characteristics of VOCs, and its results will aid in the construction of a source profile inventory of VOCs emitted from aircraft sources in real atmospheric environments.
RESUMEN
In emerging economies, the tourism industry is crucial for economic growth, but it also carries substantial environmental and social risks. Promoting sustainability and reducing the detrimental effects of tourism are two benefits of using green tourism strategies. In order to assess the efficiency of various green tourism practices in reducing these risks, this study will first define the main risks and sub-risks related to implementing green tourist practices in China's developing economy. The analytic hierarchy process (AHP) and simple additive weighting (SAW) methods are used in the study to assess the multiple risks and strategies of various green tourism initiatives. The results of the AHP method show that economic, environmental, and political risks impede the implementation of green tourism for sustainable development. According to the SAW method findings, clear and effective regulations and guidelines, infrastructure development, and public-private partnerships are top-ranked strategy risks to adopting green tourism practices in China. The study provides implications for policymakers and tourism business owners in developing economies to promote the use of sustainable tourism practices. The study highlights effective strategies to promote sustainability and increase the adoption of sustainable tourism practices. The study offers useful insights for the government, stakeholders, and policymakers to take into account the risks and challenges involved with implementing green tourism practices in the context of China.
