the Effects of Air Pollution on Respiratory Diseases in Children

A Multicenter Observational Study of the Effects of Air Pollution on Respiratory Diseases in Children

The investigators expect to reveal the association between air pollution and childhood respiratory diseases through a multi-center observational study, and summarize the relationship between air pollution and childhood respiratory diseases.

The investigators will collect the data of outpatient and emergency children in Beijing Children's hospital and other participating hospitals due to respiratory diseases from 2010 to 2021, , collect clinical data and basic information, obtain air pollution data and meteorological monitoring data and perform data processing and statistical analysis,，then analyzes the impact of air pollution on children's respiratory diseases.

Inclusion Criteria:

• All children participating in this clinical study must meet all of the following criteria:

  1. Age: 0-18 years old, male and female
  2. Consultation for respiratory diseases
  3. Visit time is between 2010-2021
  4. Provide complete personally identifiable information and medical information

Exclusion Criteria:

• All children with any of the following conditions must be excluded from this study:

  1. children who visit hospital don't for respiratory diseases
  2. children participating in this clinical study don't provide complete personally identifiable information and medical information
  3. Visit time is not between 2010-2021.