AIR pollution levels fell last month as winter winds blew away pollutants, the Environmental Protection Department (EPD) said yesterday in its monthly report on air quality. None of the EPD's three monitoring stations breached targets based on risks to health. Acting Principal Environmental Protection Officer Pang Sik-wing said strong winds throughout the month helped to keep the air clean. This was normal for November. Pollution levels are usually worse when still air and sunshine combine to trap pollutants and raise contamination levels. The EPD releases figures for three monitoring stations: Mongkok, Central and Western and Kwai Chung. The worst pollution was recorded, as usual, at Mongkok which has the only street-level station and is affected by vehicle emissions.