Table 2.

Calculation for the expected number of work days needed for the full single-instrument and single-city monitoring design of the Adult Changes in Thought Traffic-Related Air Pollution study.

	Type of cost	Number of work days	Equation
Available work days (per person)	—	229	365 d – (52 wk $\times 2$ weekend daysa $+12$ paid holidays $+3$ wk $\times 5$ paid vacation days $+5$ sick days)
Required work days	Up-frontb	40c	—
	Per-drive-dayd
	Total	232–244	—
	Regular drives	203	7 routes $\times 29$ visits
	Rescheduled drives	8–20	2–5 d $\times 4$ seasons
	Quality control	21	($203+8$) drive days $\times 1/10$e

^Note:—, no data.

^a Replaced weekend days with two weekdays for the field staff who performed weekend driving.

^b One-time or long-term costs mostly incurred before the beginning of regular monitoring for study preparation.

^c Protocol development, fabrication/assembly of the platform, and pilot testing, which specifically include writing standard operating procedures, developing the instrument setup checklist, testing and troubleshooting the instruments and the setup inside the vehicle, working with information technology personnel to develop the data organization procedure, and other preparation activities.

^d Costs related to data collection based on daily driving.

^e Quality control activities every $\sim 10$ d.