研究者越来越多地认识到早期环境暴露对儿童哮喘发展的重要性。室外空气污染被认为是哮喘发生的激发因素,但暴露是否会影响哮喘的发生发展,尚不明确。英属哥伦比亚大学Clark等采用基于人群的巢式病例对照研究调查宫内或出生后第一年暴露于环境空气污染物对日后哮喘发生的影响。研究人员采用门诊和住院病例调查1999和2000年出生在不列颠哥伦比亚省 Researchers are increasingly recognizing the importance of early environmental exposure to childhood asthma development. Outdoor air pollution is considered as a trigger for asthma, but whether exposure affects the development of asthma is unclear. The University of British Columbia Clark et al. Used a population-based, nested case-control study to investigate the effects of exposure to ambient air pollutants in the first or second year of life on asthma in the future. Researchers Using Outpatient and In-Hospital Case Surveys Born in British Columbia in 1999 and 2000