背景：2009年8月本科護理站CO2（carbon dixide）濃度過高1211ppm，護理人員常抱怨空氣品質差，專案小組觀察CO2 異常比率32%，現況分析發現問題：（1）環境：密閉空間、電器用品24小時運作；（2）人：人員密度高、維護空氣品質知識不足；（3）政策：缺乏空氣品質維護相關措施。目的：藉由本專案之進行來改善精神科急性病房護理站CO2濃度以促進人員健康，訂定短期目標：CO2濃度異常比率由32%降至10%；長期目標：CO2 濃度< 1000ppm，異常比率0%。解決方案經專案小組收集及討論文獻後，採用（1）環境：增設植栽、夜間特定電腦關機；（2）人：調配人員空間、提升空氣品質知識；（3）政策：擬訂病房室內空氣品質維護指引。結果：專案執行後，2011年10月護理站CO2 濃度降至997ppm以下，異常比率降至0%。結論：經文獻查證及跨部門合作，確立問題並執行解決方法，結果可有效改善護理站室內空氣品質，且單位同仁對整體空氣品質滿意度也隨之提升，進而營造健康友善工作環境。

Background: Ambient air at the psychiatric nursing station in our hospital had been notably poor for an extensive period of time. CO2 levels at the station averaged 1211 ppm during August, 2009 and a specialist team estimated a CO2 abnormality ratio of 32%. Analysis identified key issues in three problem areas, including (1) Environment: air at the station was not refreshed and electronic equipment was in constant operation; (2) Staff: the station had a high staff-tospace ratio and staffs lacked practical knowledge on indoor air quality maintenance; and (3) Policy: the hospital had no guidelines addressing indoor air quality maintenance.Purpose: The purpose of this project was to reduce ambient CO2 levels at the hospital’s acute psychiatric ward in order to create a high-quality working environment for all staff. The short-term goal was to reduce the CO2 abnormality ratio from 32% to 10%. Long-term goals were to maintain an ambient CO2 level in the ward below 1000ppm and further reduce the abnormality ratio to 0%.Methods: To address environment-related issues, we increased the number of indoor plants and turned certain computers off at night. To address staff-related issues, we rearranged staff activity space and educated staff on how to maintain indoor air quality. To address the policy-related issue, we drafted proposed hospital guidelines on indoor air quality maintenance.Results: Post-intervention measurements made in October, 2011 found significantly improved ambient air quality, with CO2 levels at 997ppm and a CO2 abnormality ratio of 0%.Conclusions: Results demonstrate that improvement measures implemented can effectively improve the quality of ambient air at psychiatric nursing stations. A post-intervention survey further found that staffs were both more satisfied with ward air quality and perceived a friendlier ward work environment.