The influence of the general phthalate exposure level for 6 commonly measured phthalates, assessed in urine samples Day 1 and 2 on FeNO/blood/lung function will be analyzed by mixed effects model including exposure (DBP, CA), sampling period (Day 1, Day 2) and phthalate level (Day 1, Day 2). A one-way ANOVA will be used to compare pre- and post-exposure urinary MnBP levels for various time-points to verify phthalate exposure.