Just two years after beginning operation in 2011, the number of daily passengers on the Red Line grew from an average of 100,000 to 140,000. Today more than 150,000 passengers use the train daily and an impressive 15% of riders report that they no longer use their private vehicles. This result is considered high.
Additionally, air quality in the area has been so vastly improved that carbon monoxideemissions have dropped from 500 parts per million to fewer than 100 parts per million. Astoundingly, pollution fell to such negligible levels that monitoring was deemed unnecessary.