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Given the vulnerability of Latin American countries to extreme events of climatic and geophysical origin and the frequency of these events, how do local governments manage environmental and disaster risk reduction? This article contributes to the Latin American literature about environmental management and disaster risk reduction at the local level. Employing a comparative perspective, the article examines and explains the responses of Chilean municipalities and the role of municipal commitments and social capital.

We propose a new application of inexpensive light‐emitting diode (LED)‐based Sun photometers, consisting of measuring the aerosol optical thickness (AOT) with high resolution within metropolitan scales. Previously, these instruments have been used at continental scales by the GLOBE program, but this extension is already covered by more expensive and higher‐precision instruments of the AERONET global network. For this we built an open source two‐channeled LED‐based Sun photometer based on previous developments, with improvements in the hardware, software, and modifications on the calibration procedure. Among these we highlight the use of MODTRAN to characterize the effect introduced by using LED sensors in the AOT retrieval, an open design available for the scientific community and a calibration procedure that takes advantage of a CIMEL Sun photometer located within the city, enables the intercomparison of several LED Sun photometers with a common reference. We estimated the root‐mean‐square error in the AOT retrieved by the prototypes as 0.006 at the 564 nm and 0.009 at the 408 nm. This error is way under the magnitude of the AOT daily cycle variability measured by us in our campaigns, even for distances closer than 15 km. In addition to inner city campaigns, we also show aerosol‐tracing applications by measuring AOT variations from the city of Santiago to the Andes glaciers. Measuring AOT at high spatial resolution in urban areas can improve our understanding of urban scale aerosol circulation, providing information for solar energy planning, health policies, and climatological studies, among others.

Why do some local governments successfully address issues related to environmental disaster risk management (EDRM), while others do not? This research contributes to a growing literature about the relationships between institutions, multilevel governance, and EDRM at the local level in developing countries. Supported by the frameworks of institutional analysis and polycentric governance, as well as an in-depth case study of three municipalities in Chile (Cauquenes, Lebu, and Panguipulli) with data from primary sources (e.g., interviews, surveys applied to representative samples of householders, and archival research), this study identifies the types of institutional responses that appear to improve governance outcomes. The analysis reveals that municipal operational rules combined with representation, municipal structures, institutional trajectories, and polycentric relationships between municipal governing councils and society are influential factors for successful EDRM.

In this study, we identify institutional factors and processes that foster local government decisions about disaster risk reduction, especially critical infrastructure investments and maintenance. We propose that municipal institutional capacities, organization, leadership, and multilevel governance will affect critical infrastructure investments by local governments. To examine these ideas, we employ qualitative analysis to compare two representative medium–sized cities in Chile. Our results suggest that there are two main institutional factors that constitute the foundation for improvements in critical infrastructure in Chile: municipal institutional context and the local administration’s links with decision makers at higher levels of governance. These results imply that future interventions to strengthen local government efforts for disaster risk reduction in terms of critical infrastructures would benefit from a pre-intervention diagnosis of the target location’s existing institutional context and linkages with external governance actors.