In 2008, however, the trend reversed and pollution in the Yauza exceeded its 2006 levels. The petrochemical content in the Yauza was more than three times the national limit (2008: 0.93 mg/l vs. 0.3), suspended particles fivefold (2008: 56 mg/l vs. 10.25). Iron, manganese, formaldehyde, chemical oxygen demand and biochemical oxygen demand (BOD5) also exceeded the maximum allowed limits. The Yauza tributaries (except the Ichka River) are still rated as either "dirty" or "very dirty" (pollution index 6..10). The city (as of 2008) planned the rehabilitation of the Yauza tributaries Chermyanka and Likhoborka, which was then threatened by shortage of funds in the wake of the 2008 Russian financial crisis.