Welcome to Environmental Protection Department Air Quality Health Index Website

About This Site

This website is built on HTML standard and it can be accessed with any browser that complies with this standard. But how a webpage is displayed may differ between browsers, computers and operating systems. For the best viewing, readers are suggested to use the latest version of Microsoft Edge, Mozilla Firefox, Safari or Google Chrome.

This website includes documents and files in a number of formats such as PDF, CSV and others. You may need to download and install specific software to read some of these files. Moreover, you may need to install the Hong Kong Supplementary Character Set (HKSCS) to view Chinese characters properly. Below are the links to download HKSCS and other necessary software:


Copyright Notice

The content available on this website, including but not limited to all text, graphics, drawings, diagrams, photographs and compilation of data or other materials are subject to copyright owned by the Government of the Hong Kong Special Administrative Region or other entities. Except as expressly permitted herein or where prior written authorization is obtained from the Environmental Protection Department, any reproduction, adaptation, distribution, dissemination or making available of such copyright works to the public is strictly prohibited.

Permission is granted for users to download the materials herein to store them in local computers, provided that this is solely for personal or non-commercial internal use, and provided further that this copyright notice is downloaded at the same time. Users should note that this permission only applies to Government copyright materials. Where third party copyrights are involved, an appropriate notice will appear in this website.



The information contained in this website is compiled by the Environmental Protection Department ("this Department") of the Government of the Hong Kong Special Administrative Region ("the Government") for general information only. Whilst the Government endeavours to ensure the accuracy of this general information, no statement, representation, warranty or guarantee, express or implied, is given as to its accuracy or appropriateness for use in any particular circumstances. You may wish to contact us at https://www.epd.gov.hk/epd/english/contact_us/contactus.html for the most updated information.

This website can also contain information contributed by others over whom, and in respect of which, the Government may have no influence. Users may link from this website to sites provided by others. The Government expressly states that it has not approved or endorsed the information provided by others on this website or any other sites linked to this website and the Government accepts no responsibility or liability (howsoever caused) for such information.

The Government is not responsible for any loss or damage whatsoever arising out of or in connection with any information including data or programmes on this website. The Government reserves the right to omit, suspend or edit all information compiled by the Government in this website at any time in its absolute discretion without giving any reason or prior notice. Users are responsible for making their own assessment of all information contained in this website and are advised to verify such information by making reference, for example, to original publications and obtaining independent advice before acting upon it.

The Government uses an online translation software to translate the Traditional Chinese version of its pages into Simplified Chinese version on this website. If there is any inconsistency or ambiguity between these two versions, the Traditional Chinese version shall prevail. The Government will not have or accept any liability, obligation or responsibility whatsoever for any loss, destruction or damage (including without limitation consequential loss, destruction or damage) however arising from or in respect of any use or misuse of or reliance on the Traditional Chinese version or the translated Simplified Chinese version delivered on this website.


Privacy Policy Statement

This Department is committed to ensuring that all personal data submitted through this website are handled in accordance with the relevant provisions of the Personal Data (Privacy) Ordinance.

This Department will record your visit to this website without collecting any personal identifiable information. For different purposes, you may be requested to provide your personal information through this website on a voluntary basis. We will specify the collection purpose and intended usage of your data when we invite you to provide such information and advise you how you may request access to, or correction of, the personal data provided. Unless permitted or required by law, we will not disclose your personal data to any third parties without your prior consent.

When you browse this website, cookies may be temporarily stored in your computer's hard drive, and will be removed after you close your browser. The purpose of using cookies is for internal navigation only. We will not collect any personal data from you under this circumstance. You have a choice not to accept the cookies by configurating your Internet browser settings, but if you do, you may not be able to acquire full functionality of this website.

This website uses Secure Socket Layer (SSL) encryption technology to encrypt data during the network transmission. All personal data you provided to this Department via this website are secured, and access to them is restricted to authorized personnel only.

Search service on GovHK does not collect personal identifiable information while serving search results. GovHK will share the anonymous data it collects through the search service with the Government for compiling traffic analysis on government websites. The Government will not match the data obtained from any such search activity with any personal data possibly held by the Government.

If you wish to request access to or correction of your personal data provided to this Department, you may complete the Data Access Request Form and address to the following:

Senior Environmental Protection Officer (Knowledge Management)
33/F, Revenue Tower,
5 Gloucester Road,
Wanchai, Hong Kong.

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Last revision date: 05:07 14-04-2024