Table 1.

Distribution of traffic and building density at NYCCAS network sites and Air Toxics sampling sites

		Air Toxics		Full NYCCAS
		(n = 70)		(n = 150)
Building Density	Traffic Density	Count	Percent	Count	Percent
High	High	16	23%	34	23%
Norm	High	14	20%	35	23%
High	Norm	20	29%	36	24%
Norm	Norm	20	29%	45	30%

High is defined as highest quartile of citywide 300 m X 300 m lattice values.