Noida, Dec. 23 -- The Noida traffic police has issued over 2,000 challans for pollution in Gautam Budh Nagar district after Delhi barred entry of vehicles below Bharat Stage (BS)-6 emission standards from Friday to curb pollution amid rising Air Quality Index, said officials on Monday. Enforcement has been intensified at all three Delhi borders - Chilla, Delhi-Noida-Direct (DND), and Kalindi Kunj - as well as other borders connected to Gautam Budh Nagar, the officials added. According to traffic police data, a total of 1,978 pollution challans including 696 against BS-4, 476 BS-3, 573 for violation of pollution under control (PUC), 213 for uncovered - like transporting sand with cover - and 20 visible pollution were issued from December 19 ...