The purpose of this research study to understand how environmental and genetic factors may be involved in lung function. Study participants will undergo a 1-day screening that includes a blood draw and breathing testing, return for a two-day series of testing to include blood draw, and brief breathing test before and after an inhaled challenge with either filtered air (FA) or ozone (O3). Participants return the next day for a brief breathing test, a blood draw and a procedure called bronchoscopy to evaluate the lung after the challenge. Participants then return 18 - 20 days later to repeat the two-day series of testing to be challenged with the exposure not received on the first series, (FA or O3). Each visit will take about 3 - 3.5 hours. Follow-up phone calls from the study team will occur at 24 hours after each 2-day test series. Total study duration is about one to one-and a half months.

NCT03599206

Conditions

1. Environmental and Genetic Factors on Lung Function

Interventions

1. Drug: Ozone
2. Other: Filtered Air

Inclusion Criteria: - Prior enrollment in the NIEHS Environmental Polymorphism Registry located in the greater Raleigh-Durham area - Wild type or homozygous (female)/hemizygous (male - since sex-linked) expression of the CXCR3 polymorphism rs2280964 Exclusion Criteria: - Current smokers of tobacco products including e-cigarettes or those with previous smoking history within the prior 5 years - BMI > 35 kg/m2 - Pregnant women and women who are presently lactating.