(1) POLL RESULTS OF THE 2023 ANNUAL GENERAL MEETING, THEDOMESTIC SHARE CLASS MEETING AND THE H SHARE CLASSMEETING HELD ON 28 JUNE 2024;AND(2) PAYMENT OF PROPOSED 2023 FINAL DIVIDEND

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this announcement.Datang Environment Industry Group Co. Ltd.* (A joint stock company incorporated in the People’s Republic of China with limited liability) (Stock Code: 1272) (1) POLL RESULTS OF THE 2023 ANNUAL GENERAL MEETING THE DOMESTIC SHARE CLASS MEETING AND THE H SHARE CLASS MEETING HELD ON 28 JUNE 2024; AND (2) PAYMENT OF PROPOSED 2023 FINAL DIVIDEND The Board is pleased to announce that the Meetings have been held on 28 June 2024 and all the resolutions proposed at the Meetings were duly passed. (1) POLL RESULTS OF THE 2023 ANNUAL GENERAL MEETING THE DOMESTIC SHARE CLASS MEETING AND THE H SHARE CLASS MEETING HELD ON 28 JUNE 2024 References are made to (i) the notice of the 2023 AGM dated 29 May 2024; (ii) the notice of the Domestic Share Class Meeting dated 29 May 2024; (iii) the notice of the H Share Class Meeting dated 29 May 2024; (iv) the supplemental notice of the 2023 AGM dated 13 June 2024; and (v) the circular of the Company dated 29 May 2024 and the supplemental circular of the Company dated 13 June 2024 (collectively referred to as the “Circulars”) containing details of the resolutions tabled at the 2023 AGM the Domestic Share Class Meeting and the H Share Class Meeting (collectively referred to as the “Meetings”). Unless otherwise specified herein capitalised terms used in this announcement shall have the same meanings as those defined in the Circulars.The Board is pleased to announce that the Meetings were held on Friday 28 June 2024 at No. 120 Zizhuyuan Road Haidian District Beijing the PRC and all the proposed resolutions as set out in the abovementioned notices of the Meetings were duly passed by the relevant Shareholders by way of poll.* For identification purposes only - 1 -The Meetings were convened by the Board and chaired by the Chairman of the Board and executive Director Mr. Zhu Liming. Directors attending the Meetings physically or by electronic means are as follows: Mr. Zhu Liming (executive Director); Mr. Wang Junqi Mr. Wu Daqing Mr. Chen Kan and Mr. Song Yunpeng (non-executive Directors); and Mr. Ye Xiang Mr. Mao Zhuanjian and Mr. Gao Jiaxiang (independent non-executive Directors). Mr. Shen Zhen a non- executive Director did not attend the Meetings due to work arrangement. The convening of and the procedures for holding the Meetings and the voting procedures at the Meetings were in compliance with the requirements of the Company Law of the PRC and the Articles of Association.As at the shareholding record date of the Meetings (i.e. 28 June 2024) the number of total issued Shares was 2967542000 Shares including 2343245800 Domestic Shares and 624296200 H Shares being the total number of Shares entitling the holders to attend and vote for or against relevant resolutions proposed at the Meetings. Shareholders and authorized proxies holding an aggregate of 2471072000 Shares representing 83.27% of the total issued Shares were present at the 2023 AGM. Shareholders and authorized proxies holding an aggregate of 2343245800 Domestic Shares representing 100% of the total issued Domestic Shares were present at the Domestic Share Class Meeting. Shareholders and authorized proxies holding an aggregate of 88772200 H Shares representing 14.22% of the total issued H Shares were present at the H Share Class Meeting.There were no restrictions on any Shareholders casting votes on any of the proposed resolutions at the Meetings. No Shareholders were required under the Listing Rules to abstain from voting at the Meetings. There were no Shares entitling the holder to attend and abstain from voting in favour of the resolutions proposed at the Meetings as set out in Rule 13.40 of the Listing Rules.No parties have stated their intentions in the Circulars to vote against the resolutions proposed or to abstain from voting at the Meetings.RESULTS OF THE 2023 AGM The poll results in respect of the proposed resolutions at the 2023 AGM were as follows: Number of votes (%) Ordinary Resolutions For Against Abstain 1. To consider and approve the Report of the 2471072000 0 0 Board for 2023 100.000000% 0.000000% 0.000000% 2. To consider and approve the Report of the 2471072000 0 0 Supervisory Committee for 2023 100.000000% 0.000000% 0.000000% 3. To consider and approve the Independent 2471072000 0 0 Auditor’s Report and the Audited Financial 100.000000% 0.000000% 0.000000% Statements for 2023 - 2 -Number of votes (%) Ordinary Resolutions For Against Abstain 4. To consider and approve the Final Financial 2471072000 0 0 Accounts for 2023 100.000000% 0.000000% 0.000000% 5. To consider and approve the Financial Budget 2464173800 6898200 0 Report for 2024 99.720842% 0.279158% 0.000000% 6. To consider and approve the Prof i t 2471072000 0 0 Distribution Plan for 2023 and the Proposed 100.000000% 0.000000% 0.000000% 2023 Final Dividend 7. To consider and approve the Remuneration 2471072000 0 0 Reports for Directors and Supervisors for 2023 100.000000% 0.000000% 0.000000% 8. To consider and approve the Investment Plan 2471072000 0 0 for 2024 100.000000% 0.000000% 0.000000% 9. To consider and approve the re-appointment of 2471072000 0 0 Moore CPA Limited and Da Hua CPAs 100.000000% 0.000000% 0.000000% (Special General Partnership) as international and domestic auditors of the Company for 2024 respectively with terms of engagement ended upon the conclusion of the 2024 annual general meeting of the Company and the grant of authority to the Board which further grants such authority to the senior management of the Company to determine remunerations of the auditors Number of votes (%) Special Resolutions For Against Abstain 10. To consider and approve the Proposed 2464173800 6898200 0 Amendments to the Articles of Association 99.720842% 0.279158% 0.000000% 11. To consider and approve the Proposed 2471072000 0 0 Domestic Issuance of Corporate Bonds 100.000000% 0.000000% 0.000000% As more than half of the votes were cast in favour of each of the ordinary resolutions numbered 1 to 9 and more than two-thirds of the votes were cast in favour of the special resolutions numbered 10 and 11 all resolutions were duly passed.- 3 -RESULTS OF THE DOMESTIC SHARE CLASS MEETING The poll results in respect of the resolution proposed at the Domestic Share Class Meeting were as follows: Number of votes (%) Special Resolution For Against Abstain To consider and approve the Proposed Amendments 2343245800 0 0 to the Articles of Association 100.000000% 0.000000% 0.000000% As more than two-thirds of the votes were cast in favour of the above resolution the resolution was duly passed as a special resolution.RESULTS OF THE H SHARE CLASS MEETING The poll results in respect of the resolution proposed at the H Share Class Meeting were as follows: Number of votes (%) Special Resolution For Against Abstain To consider and approve the Proposed Amendments 81874000 6898200 0 to the Articles of Association 92.229324% 7.770676% 0.000000% As more than two-thirds of the votes were cast in favour of the above resolution the resolution was duly passed as a special resolution.Computershare Hong Kong Investor Services Limited the H Share Registrar of the Company was appointed as the scrutineer at the Meetings for the purpose of vote-taking. (2) FURTHER INFORMATION ON THE PAYMENT OF THE PROPOSED 2023 FINAL DIVIDEND The final dividend of the Company for the year ended 31 December 2023 of RMB0.076 (tax inclusive) per Share (the “Proposed 2023 Final Dividend”) was approved by the Shareholders at the 2023 AGM. In order to ascertain the entitlements of the Shareholders to receive the Proposed 2023 Final Dividend the register of members of the Company will be closed from Friday 5 July 2024 to Wednesday 10 July 2024 (both days inclusive) during which period no transfer of Shares will be effected. The Proposed 2023 Final Dividend is expected to be distributed on or about Friday 20 September 2024 to the Shareholders whose names appear on the register of members of the Company on Wednesday 10 July 2024.- 4 -To be eligible to receive the Proposed 2023 Final Dividend all transfer documents must be lodged with the H Share Registrar Computershare Hong Kong Investor Services Limited at Shops 1712-1716 17th Floor Hopewell Centre 183 Queen’s Road East Wanchai Hong Kong (for holders of H Shares) or the Company’s board office in the PRC at No. 120 Zizhuyuan Road Haidian District Beijing the PRC 100097 (for holders of Domestic Shares) no later than 4:30 p.m. on Thursday 4 July 2024.The Proposed 2023 Final Dividend of the Company will be paid to holders of H Shares in Hong Kong dollar. The exchange rate of RMB into Hong Kong dollar shall be the average exchange rate as announced by the People’s Bank of China for five working days prior to the date of the 2023 AGM i.e. HK$1.00 is converted to RMB0.912424. Based on the above exchange rate the amount of the final dividend per H Share is HK$0.083295 (tax inclusive).By order of the Board Datang Environment Industry Group Co. Ltd.* Zhu Liming Chairman Beijing the PRC 28 June 2024 As at the date of this announcement the executive Director is Mr. Zhu Liming; the non-executive Directors are Mr. Wang Junqi Mr. Shen Zhen Mr. Wu Daqing Mr. Chen Kan and Mr. Song Yunpeng; and the independent non-executive Directors are Mr. Ye Xiang Mr. Mao Zhuanjian and Mr. Gao Jiaxiang.This announcement is available on the websites of the Stock Exchange (www.hkexnews.hk) and the Company (www.dteg.com.cn).