(VOCs) for counties in the Chicago metropolitan area in tons per year (tpv).

County

Total NO_x

Total VOCs

Cook

95,864

86,253

DuPage

22,000

19,742

Kane

11,335

10,533

Lake

17,615

15,143

McHenry

6675

6353

Will

23,750

14,607

Total

177,239

152,631