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. 2022 Feb 15;130(2):027009. doi: 10.1289/EHP9307

Figure 2.

Figure 2 is an image depicting a circular radius centered on the airport that encompasses the entire noise contour, displaying unexposed group, exposed group, maximum extent, airport runways, and day-night average sound level noise threshold contour.

Example of a noise contour threshold around a fictional airport and assignment of exposed and unexposed block groups (i.e., underlying polygons). The maximum extent is defined as the smallest radius of a circle centered on the airport that encompasses the entire noise contour. Block groups with ≥50% of their area within the noise contour are assigned to the exposed group, and block groups not in the exposed group but with ≥50% of their area within the maximum extent are assigned to unexposed group. Block group layer from ArcMap 10.6. Note: DNL, day–night average sound level.