Air pollution in Hong Kong is considered a serious matter. Haze is often seen hanging over the city and can last for many days depending on the direction of the wind. As of the year 2020 the PM2.5 levels of Hong Kong was almost double than that of WHO safe levels but due to more stringent WHO levels as of 2021 Hong Kong’s air quality is far behind.The World Health Organization,(WHO) recommends PM2.5 levels to be no higher than 5 µg/m3 as per WHO’s new air quality guidelines. ‘
Despite the significant improvement in air quality, at both ambient and roadside levels, between 2013 and 2017 as the Hong Kong Government implemented vigorous emission control schemes, Hong Kong’s air quality is still far from satisfactory.
Hong Kong is falling behind major international cities, like London, Singapore, New York, Tokyo, in terms of annual average of particulate matters (PM2.5) level. The nitrogen dioxide levels at roadside are still doubling the safe level recommended by World Health Organisation. Global studies show that these air pollutants are causing cancer, respiratory diseases and circulatory diseases, which consequently, jeopardising the well-being of Hong Kong citizens.