With temperatures dropping in the city, the level of suspended air particles has shot up. The Maharashtra pollution control board (MPCB) says the quantity of respirable suspended particulate matter (RSPM) crossed the 200 microgram per meter cube this month. On December 7, the city recorded an RSPM level of 210 microgram per meter cube of air. The permissible level is 100 microgram per meter cube. On December 14, this plummeted to 188 microgram per meter cube. But, last week, the RSPM level stood at 145 microgram per meter cube.