Specialisation ranking among US metro-regions: the numerator is the ratio of jobs in the segment and metro-region in 2010 to total metro-region employment in 2010. Total does not include public transit or waste management. There were roughly 45 000 clean economy jobs in the Chicago Tri-State metro-region in 2010 (excluding public transit and waste management jobs, which would add roughly 34 000 jobs) (Table 1.6).