環境保護主任（空氣質素分科）的主要職責是：（a）就空氣污染、保護臭氧層及地球氣溫上升等事宜，協助擬備立法建議和制訂工作守則、指引、程序、標準、指標及策略；（b）規劃和推行與空氣質素監理及監控工作有關的空氣質素監測及調查，包括：分析和闡述所得的結果；監管儀器的檢測工作；（c）參與評估與空氣質素有關的計劃及發展大綱，並就空氣污染問題及空氣質素管制工作，提供意見及專業資料；（d）就空氣污染、臭氧層耗損及地球氣溫上升等事宜，在推行和執行法定管制方面，組織和提供專業資料，包括：處理許可證和牌照的申請；就檢控及上訴個案收集、整理和提交證據；以及（e）透過各類方法，例如擬備和介紹教育及宣傳資料，向市民和社會賢達傳達空氣質素監測政策和策略。

An Environmental Protection Officer (Air Stream) is mainly deployed to (a) assist in the preparation of legislative proposals, and in the development of codes of practice, guidelines, procedures, standards and objectives and strategies relating to air pollution, ozone layer protection and global warming; (b) plan and implement programmes for air quality monitoring and investigations in relation to air quality management and control activities, including analysis and interpretation of results and supervision of instrumentation; (c) contribute to the assessment of projects and development plans with regard to air quality, and provide advice and professional input on air pollution problems and air control activities; (d) organise and provide professional input in relation to the implementation and enforcement of statutory controls on air pollution, ozone layer depletion and global warming, including the processing of applications for permits and licences, and the collection, collation and presentation of evidence in prosecution and appeal cases; and (e) assist through various means, such as the preparation and presentation of educational and publicity materials, in conveying air quality management policies and strategies to the public, and to prominent community representatives.