AN AIRBORNE STUDY OF AIR-QUALITY AROUND THE HONG-KONG TERRITORY

An airborne study of air quality was made around the Hong Kong Territo ry during October and November of 1994. The air quality measurements i ncluded NO, NOy, O-3, CO, SO2, condensation nuclei, black carbon, aero sol light scattering, and aerosol particle size and number. Complex wi nd patterns are present, mixing the emissions from Kong Kong with aged pollution transported into the region from the People's Republic of C hina. This leads to poor air quality on the west and north sides of th e Hong Kong Territory. CO mixing ratios were 200-800 parts per billion by volume (ppbv), and black carbon was present In the range of 5-7 mu g/m(3). Ozone mixing ratios of 100-120 ppbv were typical. The CO/NOy ratio in the heavily polluted region was 10, similar to the CO/NOy emi ssion ratio for pollution emitted from the People's Republic of China immediately upwind of Hong Kong.