The use of portable sensors to measure air quality is a promising approach for the management of urban air quality given its potential to improve public participation in environmental issues and to promote healthy behaviors. However, not all the projects that use air quality mobile sensors consider the potential effects of their use on the attitudes and behaviors of non-expert individuals. This study explores the experiences, perceptions, attitudes, and behavioral intentions of 12 participants who used a real-time NO sensor over a period of 7 days in the metropolitan area of Barcelona and compares them with 16 participants who did not have access to the device but rather to documentary information. The study design is based on recombined focus groups who met at the beginning and end of a 7-day activity. The results suggest that the experience with the sensors, in comparison with the traditional information, generates greater motivation among participants. Also, that the use of the sensor seems to support a more specific awareness of the problem of air pollution. In relation to risk perception, the textual and visual information seems to generate stronger beliefs of severity among participants. In both groups, beliefs of low controllability and self-efficacy are observed. Neither using the sensor nor reading the documentary information seems to contribute positively in this sense. The results of the study aim to contribute to the design of public involvement strategies in urban air pollution.

A variety of policy instruments that impose restrictions on traffic are being put in place across European cities to improve urban air quality. These measures include various schemes such as congestion charges, low emission zones (LEZs) and other traffic calming measures. In this paper, we are interested in the public acceptance of LEZs. Recent studies show high levels of public support for LEZs across Europe. However, specific research on public attitudes towards LEZs is limited. We conducted a self-administered survey (online) among residents in Barcelona, Spain. Based on a previous analytical model, bivariate and path analysis modelling was used to examine the association between key independent variables and acceptance. The results showed that most surveyed residents had a positive attitude towards implementing the LEZ, perceiving this policy instrument as a fair and effective measure to reduce air pollution. Perceived process legitimacy, perceived global impacts and affect had a significant direct effect on acceptance. Prior attitudes and personal orientations and, to a lesser extent, personal characteristics, were indirectly associated with levels of acceptance.

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In recent decades, several Latin American cities have implemented policy instruments to reduce urban air pollution and traffic congestion such as license plate–based restrictions on car use. Our research analyzes the factors influencing the public acceptance of these urban policies in four cities: Bogotá, Mexico City, Santiago de Chile, and Quito. We use semi-structured interviews and digital diaries to examine participants’ beliefs and emotions about vehicle restrictions as well as their daily mobility experiences. The study illustrates the importance of three main beliefs in shaping the public acceptance of the measures (perceived effectiveness, perceived fairness, and perceived personal impacts). The results also show a certain resignation on the part of the participants, accepting that the policies are necessary and, to some extent, effective in pacifying traffic and improving air quality in highly populated cities, even if the policies generate certain undesirable distributional and personal impacts. The study uncovers the importance of the local context in understanding why certain urban policies, successfully applied in other contexts, might have lower levels of public support in Latin American cities. A high population density, regulatory shortcomings, enforcement difficulties, and deficits in infrastructure and public transport all create a mobility context in which some policies to improve urban air quality and traffic congestion generate high levels of frustration and ambivalence among the residents.

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