Wuhan Children''s Hospital(Wuhan Maternal and Child Healthcare Hospital) Tongji Medical College Huazhong University of Science and Technology Wuhan 430015 China;
Key Laboratory of Environment and Health Ministry of Education&Ministry of Environmental Protection and State Key Laboratory of Environment Health School of Public Health Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 China;
Wuhan Environmental Monitoring Center Wuhan 430015 China;
College for Public Health&Social Justice Saint Louis University^Saint Louis MO 63104 USA;
air pollution; fine particulate matter; ozone; hypertensive disorders of pregnancy; gestational hypertension;