Association between Residential Proximity to PERC Dry Cleaning Establishments and Kidney Cancer in New York City

Table 1

Summary of exposure levels based on density of dry cleaners.

Exposure level	Density of dry cleaners
	(dry cleaners per sq km)
Exposure level 1	0 to 0.47
Exposure level 2	0.47 to 0.90
Exposure level 3	0.90 to 1.50
Exposure level 4	1.50 to 2.70
Exposure level 5	2.70 to 16.43