Table 1.

Complete and alternative designs for ultrafine particle mobile monitoring to assess model performance and costs.

Design component	Complete all-data designa	Alternative monitoring design changes	Alternative monitoring design options
Number of sites	309	Fewer sites	100, 150, 200, or 250
Number of visits	29b	Fewer visits per site	4, 6, 12, 16, 20, or 24
Day of the week	All days	Fewer days	Weekdays onlyc
Hour	Most hours for 0500 hours to 2100 hours (5 A.M.–11 P.M.)	Fewer hours	Business or rush hours onlyc
Season	4 seasons	Fewer seasons	2 or 3 seasonsd

^a The ultrafine particle monitoring campaign of the Adult Changes in Thought Traffic-Related Air Pollution study; we used the complete all-data design as the reference to compare with all alternative designs except temporally-restricted designs with fewer days, hours, or seasons where a reduced design with 12 visits (309 sites and 12 visits) is the “complete all-data” design.

^b Median with a range of 26–35.

^c Monday to Friday only.

^d Six combinations of two seasons and four combinations of three seasons.