Fact · environment · 2023
Nitrogen oxides emissions
氮氧化物排放量
Figure and reference date
52,980 tonnes
52 980 公噸
Notes and definition
Includes hill fires; rounded to the nearest ten. Latest complete year in the 2026 booklet is 2023.
Other figures in this group (environment)
Figures in the same group are not necessarily additive — check the basis note above first. Environment and energy.
| Item / 項目 | Figure / 數字 | As of / 時點 | Source / 來源 |
|---|---|---|---|
| Electricity consumption 用電量 | 164,433 terajoules 164 433 太焦耳 Domestic 44,471; commercial 108,849; industrial 10,886; street lighting 227. 1 terajoule = 10^12 joules. | 2025 | Hong Kong in Figures, 2026 Edition |
| Greenhouse gas emissions 溫室氣體排放量 | 34,500 kilotonnes CO₂-e 3 450 萬公噸二氧化碳當量 Rounded to the nearest hundred and subject to revision. Latest complete year in the 2026 booklet is 2023. | 2023 | Hong Kong in Figures, 2026 Edition |
| Sulphur dioxide emissions 二氧化硫排放量 | 3,910 tonnes 3 910 公噸 Includes hill fires; rounded to the nearest ten. | 2023 | Hong Kong in Figures, 2026 Edition |
| Fine suspended particulates (PM2.5) emissions 微細懸浮粒子排放量 | 2,710 tonnes 2 710 公噸 Includes hill fires; rounded to the nearest ten. | 2023 | Hong Kong in Figures, 2026 Edition |
| Municipal solid waste disposal 都市固體廢物處置量 | 3.847 million tonnes 384.7 萬公噸 Domestic and commercial & industrial waste delivered to disposal facilities, excluding construction waste and recovered MSW. | 2024 | Hong Kong in Figures, 2026 Edition |
| Recyclables recovered from municipal solid waste 從都市固體廢物回收的可循環再造物料 | 2.018 million tonnes 201.8 萬公噸 Recycled locally or outside Hong Kong. | 2024 | Hong Kong in Figures, 2026 Edition |
| Hong Kong Drinking Water Standards parameters 香港食水標準水質參數 | 61 parameters after the 2025 update 2025年更新後61項 HKDWS established September 2017, 60 parameters from 2021, updated to 61 on 23 April 2025, with a Surveillance List, Watch List and aesthetic guidelines. | 2025-04-23 | DEVB: Hong Kong Drinking Water Standards |
| Fuel mix for electricity generation 發電能源組合 | Natural gas 55%, nuclear & renewables 28%, coal 17% (2025) 天然氣55%、核能及可再生能源28%、煤17%（2025年） EEB territory-wide generation fuel mix by sent-out basis, 2025. Renewables such as local solar remain a small share. | 2025 | Environment and Ecology Bureau: Hong Kong Fuel Mix for Electricity Generation |
| Municipal solid waste per-capita disposal 都市固體廢物人均棄置量 | 1.4 kg/person/day (2024; 3.85m tonnes disposed) 1.4 公斤／人／日（2024；總棄置385萬公噸） EPD Solid Waste Monitoring: per-capita disposal down a third straight year; ~34% recovery. | 2024 | Hong Kong Solid Waste Monitoring Report |
| Municipal solid waste disposal quantity 都市固體廢物處置量 | 3.97 million tonnes 3.97 百萬公噸 EPD solid waste monitoring report. | 2023 | EPD: Monitoring of Solid Waste in Hong Kong (MSW & recovery rate) |
| Municipal solid waste recovery rate 都市固體廢物回收率 | 33% (2023) / 34% (2024) 33%（2023）／34%（2024） EPD solid waste recovery rate. | 2024 | EPD: Monitoring of Solid Waste in Hong Kong (MSW & recovery rate) |
| Country parks and special areas area 郊野公園及特別地區面積 | 44,842 hectares 44,842 公頃 AFCD country parks figures. | 2023 | AFCD: number and area of country parks |
6 more figures in this group are listed in Environment and energy.
Other figures from the same official source
These figures come from the same registered document: “Hong Kong in Figures, 2026 Edition” (Census and Statistics Department). Being in one document does not make them additive.
| Item / 項目 | Figure / 數字 | As of / 時點 | Source / 來源 |
|---|---|---|---|
| Population density, Hong Kong Island 香港島人口密度 | 14,540 persons per km² 每平方公里 14 540 人 Mid-year. Excludes marine population and reservoir areas. | 2025-06 | Hong Kong in Figures, 2026 Edition |
| Population density, Kowloon 九龍人口密度 | 47,780 persons per km² 每平方公里 47 780 人 Mid-year. Excludes marine population and reservoir areas. | 2025-06 | Hong Kong in Figures, 2026 Edition |
| Population density, New Territories and Islands 新界及離島人口密度 | 4,250 persons per km² 每平方公里 4 250 人 Mid-year. Excludes marine population and reservoir areas. | 2025-06 | Hong Kong in Figures, 2026 Edition |
| Number of households 住戶數目 | 2,778,100 2 778 100 | 2025 | Hong Kong in Figures, 2026 Edition |
| Total land area 陸地總面積 | 1,114.6 km² 1 114.6 平方公里 Year-end figure. GovHK Fact Sheet states 1,114.57 km². | 2025-12 | Hong Kong in Figures, 2026 Edition |
| Hong Kong Island land area 香港島陸地面積 | 80.7 km² 80.7 平方公里 | 2025-12 | Hong Kong in Figures, 2026 Edition |
| Kowloon land area 九龍陸地面積 | 46.9 km² 46.9 平方公里 | 2025-12 | Hong Kong in Figures, 2026 Edition |
| New Territories and Islands land area 新界及離島陸地面積 | 986.9 km² 986.9 平方公里 | 2025-12 | Hong Kong in Figures, 2026 Edition |
74 more figures come from the same document; see Environment and energy.
Verified questions that cite this figure
Which departments monitor Hong Kong’s air quality and environmental data?
Air quality is monitored by the Environmental Protection Department (EPD) through its monitoring network, covering particulate matter and ozone. Greenhouse-gas, waste and water-quality data are also published by EPD and related departments as official figures.
（已核對問題頁目前只有中文版；上面嘅英文標題同答案本身係資料檔嘅官方英文欄位。）
How to cite this figure
Hong Kong Story, “Nitrogen oxides emissions”, https://hongkongstory.org/en/facts/nox-2023, data as at 2023 (retrieved ＿).
中文：香港紀事館，〈氮氧化物排放量〉，https://hongkongstory.org/facts/nox-2023，資料時點 2023（查閱日期 ＿）。
Machine-readable: /api/v1/facts.json (id = nox-2023) · OpenAPI 3.1 ·/llms.txt
Registered source
Hong Kong in Figures, 2026 Edition
Census and Statistics Department
Official document dated 2026-04; last checked by this site 2026-09-05.
This site is a secondary compilation: the official text prevails. If the figure above differs from the official document, the official document is correct.