Air Pollution Monitoring

Dr. Zhi NING
Tel: 3442-4620

Email address

The Aerosol and Air Pollution Group is a multidisciplinary team at CityU focusing on the investigating the sources, characteristics, impacts and control of urban air pollution. Our mission is to contribute to the development of systematic and fundamental knowledge on air pollution to inform effective air quality management and to develop break-through technologies and control strategies to protect public health and mitigate climate change. Our research activities include the physicochemical and toxicological characterization of aerosol and air pollution from traffic sources and in urban atmospheric environment, and the characterization of personal exposure in complex and heterogeneous microenvironments. We also devise and develop new and aerosol related measurement and control technologies to meet the emerging environmental challenges.

Campus Air Monitoring (CAM) Network in CityU for Environmental Awareness and Energy Saving Facility Management

Energy consumption involving ventilation and air conditioning in buildings represents a major share of campus-wide energy usage. However, the microclimate inside the classrooms can be used as an essential indicator for the smart energy-saving ventilation system. The CityU Campus Air Monitoring Network has installed a number of sensors to measure both the indoor and outdoor air quality in CityU. Five locations which are always crowed with people are selected to place the equipment, including Lecture Theater 3, Lecture Theater 13, AC3 6/F study area, U-circle and CityU main entrance ("Time Tunnel"). The sensor examines different pollutants depending on the locations. It measures CO2, PM2.5, temperature, pressure, light intensity, voice level and humidity at indoor places. For outdoor places, pollutants like NOx, O3, PM and CO will be measured.

Semi-volatile particulate matter (PM) species in roadside environment

The objectives of the project are to understand the role of semi-volatile PM components in changing particle size, morphology and chemical composition in roadside environment that largely affect the pedestrian exposure, and to determine how the environmental conditions, such as temperature and relative humidity, affect the interaction of semi-volatile components and particles. The results from the project will clarify the role of semi-volatile species in driving the dynamic evolution of vehicular exhaust PM and provide an insight of the underlying mechanisms by which semi-volatile PM components affect the pedestrian roadside exposure.

The deployment and data quality assurance of the new batch of Mini Air Stations in NJU and other test sites

In this project, there boxes were designed and installed in the tower, with a height of 25m, 50m and 75m respectively. The objective of the project is to investigate the air pollutant concentrations behavior varying with the physical height. Three boxes were independently designed and fabricated by Aerosol and Air Pollution Lab from CityU, embedded with different gas sensors (NO, NO2, CO, SO2, O3),PM sensors as well as VOC sensor.

Black carbon in urban atmosphere: size and coating from near-source to ambient environment

This project will integrate traditional filter based approaches for chemical characterization of black carbon mixture, and new approaches of continuous BC size measurement developed by our group to determine the dynamic evolution of BC in the atmosphere. The complementary approaches will be implemented in typical urban atmosphere from fresh to mixed and aged aerosols with diurnal and seasonal variations. The results from this project will provide more refined inputs of black carbon in global and regional climate models to shorten the gap between observed and simulated output for better climate prediction. And a better understanding and estimation of exposure to black carbon and PAHs by the population in roadside and urban environment in Hong Kong and other cities is also expected.

Provision of Services for Continuous Monitoring of Roadside Air Quality in the Northern Part of Hong Kong

The aim of this project is to present a technical approach for continuous roadside air monitoring in northern part of Hong Kong to document the traffic related air pollutants trend associated with the vehicular emission control programme. This project carrys out a continuous air monitoring of traffic related air pollutants at three roadside environments at the northern part of Hong Kong and monitors the real-time concentrations of black carbon, a tracer for diesel emissions and carbon dioxide (CO2) at two designated sites in Hong Kong, which also provides data analysis and interprtation results with DCV programme.