Hyderabad Sept. 16: Air pollution levels in the city have climbed further beyond the national ambient air quality standards. Abids, Punjagutta, Paradise and Charminar zones have recorded higher levels of total suspended particulate matter (TSPM) and respirable suspended particulate matter (RSPM), according to studies conducted by the AP Pollution Control Board. While the national average TSPM level is 200 micrograms per metre cube (