Commentary Table 2.

Overview of Procedures Performed on the Days Before, During, and After Exposure^a

Procedure	Pre-Exposure Visits			Exposure Visit			Post-Exposure Visit
	3 Days Before	2 Days Before	1 Day Before	Before Exposure	During Exposure	After Exposure	1 Day After
Laboratory ozone exposure					X
Personal exposure monitoring (ambient ozone and NO2)	X	X	X
Activity diary	X	X	X
Physical exam			X
Health questionnaire			X
Symptom questionnaire				X	X	X	X
Vital signs			X	X	X	X	X
Electrocardiogram (ECG)				–––––––––Continuous––––––––––
Brachial artery ultrasound			X			X
Blood draw			X			X
Spirometry				X		X	X
Minute ventilation					X
Sputum induction							X

^a Three separate sessions were held in which participants were exposed to 0, 70, and 120 ppb ozone (in randomized order) for 3 hours while exercising intermittently (for a total of 9 visits).