title: [Effects of reforestation on tree pollen sensitization in inhabitants of Nuevo Leon, Mexico].
abstract: BACKGROUND
  Climate change has implications for health, ecology and society. Urban green areas are a key element in the planning of cities, promoting citizen interaction with the environment, as well as health. Lack of planning and design of these areas as well as the selection of ornamental trees can be a trigger of pollen allergy in the surrounding population. Reforestation is among the programs implemented by the government that have an impact on allergy. Environmental reforestation programs do not take into account the allergenic potential of some species. In the last 4 years, the government of Nuevo Leon, Mexico, has planted nearly 18,000 Quercus species trees, in addition to an unknown number of Fraxinus species trees that are listed as tree species with high pollen production.
  
  
  OBJECTIVE
  To identify changes in tree pollen sensitization, based on environmental reforestation programs.
  
  
  METHODS
  A retrospective and descriptive study was done in which positive skin prick tests to pollen from trees in the interval of 2010-2014 were analyzed, correlating between tree species used for reforestation and increased sensitivity to the former.
  
  
  RESULTS
  A statistically significant increase in pollen sensitization to species with which Nuevo Leon was reforested was found, along with a decrease in sensitization to the species that were not reforested.
  
  
  CONCLUSIONS
  Reforestation contributes to some extent to the change in the pattern of positive skin tests and may result in more frequent exacerbations of respiratory diseases. It is an activity that should always be regulated and assisted by experts in the according field.
authors.affiliation: Centro Regional de Alergología e Inmunología Clínica (CRAIC), Hospital Universitario, Monterrey, Nuevo León, México. drsamuelpalma@gmail.com.
authors.forename: Samuel
authors.initials: S
authors.lastname: Palma-Gómez
authors.forename: Sandra Nora
authors.initials: SN
authors.lastname: González-Díaz
authors.forename: Alfredo
authors.initials: A
authors.lastname: Arias-Cruz
authors.forename: Alejandra
authors.initials: A
authors.lastname: Macías-Weinmann
authors.forename: Laura Elizabeth
authors.initials: LE
authors.lastname: Amaro-Vivian
authors.forename: Rafael
authors.initials: R
authors.lastname: Pérez-Vanzzini
authors.forename: José Julio
authors.initials: JJ
authors.lastname: Gutiérrez-Mujica
authors.forename: Adrián
authors.initials: A
authors.lastname: Yong-Rodríguez
keywords: Aeroallergen; Asthma exacerbation; Atopy; Global warming; Sensitization pollen