What is PRAISE-HK (Project Promo)

Part 1 – PRAISE-HK: Game-changer in air pollution exposure control

Principal Investigator and Project coordinator – Prof. Alexis Lau – explained the concept of PRAISE-HK. Prof. Lau asserted that though the level of air pollution has been improved over the past years, its level still falls short of the World Health Organization standard. The unique nature of PRAISE-HK is that the module provides users with personalized information wherever they are physically. Users can therefore make informed decisions to reduce personal exposure to unhealthy air and subsequent health risks. PRAISE-HK not only identify hot-spots, it is a very practical and visual approach for people conceptually to know air pollution.



Part 2 – Making of PRAISE-HK: The 4 key elements

PRAISE-HK does not conduct monitoring as the program carries out more complex computation of data called high-resolution air quality characterisation. In the past, analytical devices were bulky. Today, the small size of a sophisticated air quality tracking system makes it convenient to carry around. There are also high speed computers capable of analyzing in a matter of hours several days’ worth of data collected. Big data improves the accuracy of data analysis by gathering information released onto the Internet in real time. Smartphone location-tracking uses the whereabouts of mobile phones to provide accurate data to improve the quality of life of the users.


[Do-You-Know] Series

Video 1 – Exposure Science – A New Paradigm for Managing Air Pollution

Prof. Christopher Frey (North Carolina State University)

Prof. Frey shared with us how quantifying exposure, which is the personal contact with air pollution, can inform people and help them to make decisions to reduce their exposure. He also mentioned that exposure is the most important consideration when it comes to the health concerns regarding air pollution as it is the air people personally breathe. Furthermore, the benefit of controlling exposure for private businesses, for example providing an environment with clean air to workers and customers, is explained. Lastly, he talks about the localized nature of the air pollution sources, and street canyons trapping air pollution, and how they could be a hotspot for air pollution due to the urban design of Hong Kong.



Video 2 – Emerging Air Quality Sensor Technologies

Dr. Gayle Hagler (United States Environmental Protection Agency)

Dr. Hagler talks about the past, present, and the future of air quality monitoring in this video. She says that in the past, most of the monitoring has been done by sparsely-located expensive government-controlled air quality monitoring stations. Those highly accurate stations are deemed to be the “gold standard,” however, due to their size and cost, it is impossible to deploy those monitors at very fine spatial scale. This has led to many private companies developing portable or even wearable air quality monitors. She also talks about the pros and cons of miniaturized devices, such as cheaper cost and lower accuracy. She also says that more research to evaluate the quality of the data in varying environments and better ways to interpret the data from the sensors for the health research would be needed.


Video 3 – Priorities for Cleaner Air & Better Health

Prof. Christine Loh (HKUST)

Prof. Loh shares with us that the key message is to understand where our biggest health risks are in our district (e.g. roadside, power plants and ship emissions), and to also be confident that if we are willing to take important decisions, we can make substantial improvements. Prof. Loh also suggests to take immediate approaches in terms of cleaning the air hence reducing corresponding health risks, first is to really pay attention to VOCs (volatile organic compounds) and ozone; and the second thing is to continue to focus at roadside air pollution. Lastly, she talks about the steps the government is taking, such as subsidising replacement of taxi parts that generate air pollutants.

Video 4 – Urban Environment and Exposure Health Risk Management

Prof. Christopher Frey (North Carolina State University)

Prof. Frey introduces the common pollutants (PM2.5, NO2, O3, and CO) from outdoor environment and their health effects. He also explains the benefits of portable air quality sensors in raising public understanding about the variability of air quality between different places we spend most of our times in, such as homes, indoor buildings, roadside, MTR stations, buses, and shopping malls. Prof. Frey then explains what we could do to lower our exposure to and the health risks from air pollution, if we have air quality variation information in the palm of our hand.


Street Interview Series

Video 1 – What is AQHI?

Note: Nowadays, there are a total of 18 air quality monitoring stations in Hong Kong, including the new stations in the Southern District and the Northern District operated since 2020.

Video 3 – Air Quality in your Home Town



Video 2 – Health Impacts on Young Children


AQ Classroom Series

Air Quality Health Index

Note: Nowadays, there are a total of 18 air quality monitoring stations in Hong Kong, including the new stations in the Southern District and the Northern District operated since 2020.




PRAISE-HK App Promo Video

PRAISE-HK App Demo Video

PRAISE-HK Launching Ceremony and Smart-city Forum

Please click HERE to view video record of PRAISE-HK Launching Ceremony and Smart-city Forum 

Eco Expo Asia 2018

Sensing technology in application & enforcement

Introduction of PRAISE-HK at 6RAQM Conference


PRAISE-HK EXP Scenario - Bookmark Notification

PRAISE-HK EXP Scenario - Routing

PRAISE-HK-EXP Scenario - AQ Map

PRAISE-HK-EXP Scenario - My Exposure