因應政府能源政策，於2025年時欲達到天然氣、燃煤、再生能源比例為5:3:2，未來燃氣發電將成為主流，討論其對空氣品質之影響非常重要，因天然氣中主要的成分是甲烷，其在燃燒過程中會有甲醛的生成可能性，而甲醛屬於致癌物且為有害空氣污染物。
本研究為瞭解燃氣電廠燃燒天然氣所產生的甲醛對環境之影響性，利用CMAQ三維網格模式模擬燃氣電廠甲醛排放後甲醛之變化情況，而甲醛最大增量濃度為發生於前金測站之0.0093ppb，最大著地濃度為大潭電廠發生於5月之0.053ppb，最大貢獻比例為0.777%，且目前台灣各機組之排放係數皆遠低於美國環保署所公告之甲醛排放係數，因此目前台灣燃氣電廠甲醛排放對於周界甲醛濃度影響甚低。
又因甲醛屬於揮發性有機物，會導致臭氧濃度變化，因此需探討燃氣電廠甲醛排放對於臭氧濃度之影響，根據目前法規所規範之臭氧最大小時平均值以及臭氧最大8小時平均值，兩者臭氧變化情形作分析。
南部、大潭、興達、通霄、大林電廠之甲醛排放對每日臭氧小時值最大貢獻比例分別為0.056%、0.040%、0.036%、0.11%、0.071%，於所有測站中，五座電廠合併之臭氧小時值最大貢獻比例位於新莊測站，其貢獻比例為0.27%，對每日臭氧8小時值最大貢獻比例分別為0.12%、0.063%、0.12%、0.12%、0.12%，於所有測站中，五座電廠合併之臭氧8小時值最大貢獻比例位於林園測站，其貢獻比例為0.41%，由各結果顯示，電廠排放甲醛後對於臭氧之貢獻比例均甚低，因此電廠甲醛排放並非影響周界臭氧濃度之主因。

We use the Community Multiscale Air Quality Modeling System to simulate the changes in formaldehyde after the gas-fired power plants emit formaldehyde. The maximum increase in the formaldehyde concentration is 0.0093ppb in Qianzhen measurement station, the maximum landing concentration is 0.053ppb, which occurred in the Datan Power Plant in May, and the largest contribution of the formaldehyde is 0.777%.
Also because formaldehyde is a volatile organic compound, which will change the concentration of ozone. Therefore, it is necessary to check the effect of formaldehyde emissions from gas-fired power plants on ozone concentration according to the current laws on the maximum hourly average value of ozone and the maximum 8-hours average value of ozone. The two values of ozone changes will be analyzed in this study.The largest contribution ratios of formaldehyde emissions to the daily hourly ozone value of the Southern, Datan, Xingda, Tongxiao, and Dalin power plants are 0.056%, 0.040%, 0.036%, 0.11%, and 0.071% respectively. Among all the stations, the largest contribution ratio of the hourly ozone value of the combined power plant is located at the Xinzhuang Station, which contributes 0.27%, and the largest contribution ratio to the daily 8-hours value of ozone is 0.12%, 0.063%, 0.12%, 0.12%, 0.12%, respectively.Among all the observation stations, the largest contribution ratio of the 8-hour ozone value of the five power plants is located at the Linyuan observation station that contribution ratio is 0.41%. The results shows that the contribution ratio of the power plant to ozone after the emission of formaldehyde is very low. The results show that the formaldehyde emission of the power plant is not the main factor affecting the ozone concentration in the environment.

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