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Written by: Zhang Jiamin
2021-01-21 19:00
Last update date: 2021-01-21 19:01
The Healthy Air Action analyzed data from the Environmental Protection Agency's 2020 air quality monitoring station and found that although nitrogen dioxide, one of the main air pollutants, has fallen by 13% compared to 2019, the concentration is still 70 micrograms per cubic meter, exceeding the World Health Organization and Hong Kong The air quality indicator is 75%.
In addition, Tuen Mun has once again become the general monitoring station with the highest pollution level. The annual average levels of the two types of suspended particles are higher than other general monitoring stations.
The Environmental and Healthy Air Action refers to the fact that in response to the epidemic, people are working at home, and it is found that the time period during which bus companies have reduced their frequency coincides with the time when the concentration of pollutants has dropped significantly.
They propose to add more low-emission zones, expand the regulation of vehicles other than buses, and promote electric vehicles.
The Healthy Air Action analyzed data from the Environmental Protection Agency's 2020 air quality monitoring station and found that although nitrogen dioxide has dropped by 13% compared to 2019, the concentration still reached 70 micrograms per cubic meter, exceeding the World Health Organization and Hong Kong's air quality targets.
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The Healthy Air Initiative refers to the fact that the levels of major air pollutants in Hong Kong last year, including fine suspended particulates (PM2.5), respirable suspended particulates (PM10) and nitrogen dioxide (NO2), have all dropped compared to 2019.
Among them, overall, PM2.5 experienced the largest drop, 21% lower than last year, and the concentration recorded at its roadside monitoring stations also fell 24% compared to last year.
While PM10 and NO2 fell 16% and 13% respectively.
Mong Kok recorded the highest concentration of nitrogen dioxide
However, the Healthy Air Action stated that the annual average concentration of NO2 at roadside monitoring stations still reached 70 micrograms per cubic meter, which exceeded the World Health Organization and Hong Kong's Air Quality Objectives (AQO) limit by 75%, that is, the upper limit was 40 micrograms per cubic meter.
Among them, the annual average concentration of NO2 recorded at the roadside monitoring station in Mong Kok was the most serious, reaching 74 micrograms per cubic meter, which exceeded the limit by 85%.
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The biggest drop in pollutant concentrations last April
In response to the outbreak, the government and private organizations have arranged for employees to work from home, and bus companies have also adjusted their schedules.
Action for Healthy Air According to data from the Transport Department, it was found that the number of passengers on franchised buses from January to October last year fell compared to 2019. Among them, April had the largest drop of 39%.
According to data from roadside monitoring stations, the period of time when the concentration of pollutants dropped significantly coincided with the time of the large-scale outbreak of the epidemic. It is believed that the reduction in bus frequency has improved the level of roadside pollutants.
The Healthy Air Action refers to the period of time when the concentration of pollutants dropped significantly and the time of the large-scale outbreak of the epidemic. It is believed that the reduction in bus frequency has improved the level of roadside pollutants.
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The Healthy Air Campaign found that Tuen Mun once again became the general monitoring station with the highest pollution level last year, and its annual average levels of PM10 and PM2.5 were higher than other general monitoring stations. As for Kwai Chung and Tap Mun, the highest levels of NO2 were recorded respectively. And ozone levels.
The ozone (O3) level in Hong Kong last year was slightly lower than the average annual concentration of general monitoring stations, but the annual average concentration of roadside monitoring stations remained at the highest level since records were recorded in 2011, which is the same per cubic meter as in 2019 32 micrograms.
The Healthy Air Initiative urges the authorities to specify the direction for the development of electric vehicles in Hong Kong in the roadmap for the popularization of electric vehicles, focusing on the development of electric commercial vehicles, including the introduction of more electric buses and minibuses.
In addition, the government should formulate a timetable to phase out vehicles powered by fossil fuels.
They also proposed to add more low-emission zones and expand the regulation of vehicles other than buses.
In addition, they urged the government to complete the "Study on Photochemical Ozone Pollution and Regional and Trans-regional Transmission Characteristics in the Greater Bay Area" as soon as possible, and propose specific improvement plans within three years; the local air quality indicator (AQO) should be updated and the PM 2.5 excess should be eliminated 35 times limit.
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Air pollution index
