According to a study in the journal Urban Forestry & Urban Greening, the factors that most influence and increase the risk of tree failure in São Paulo (the capital of São Paulo state in Brazil) are the height of nearby buildings and the age of the neighborhood. Sidewalk width and tree height are the next most significant variables.
Click here for original story, Risk of urban tree falls in São Paulo is influenced by building height and neighborhood age, study shows
Source: Phys.org