工業排放廢氣中可能含有重金屬污染，如：銅、鋅、鎘、鉛、鎳、鉻、汞以及砷等。這些微粒會隨著大氣擴散、沉降，進入植物體，人類經由攝食而健康受影響。過去對於重金屬污染土壤、農作物的狀況調查、檢驗等皆需耗費大量時間、人力及經費。此外，民眾可能因攝食這些受污染之農產品而暴露了本可避免之風險。
1992年後多介質模式研究興起，藉由搭配污染物濃度與氣象等資料，推測污染物經由環境介質，如：空氣、土壤、水等，進入作物之濃度變化，並將推估結果應用於計算人體暴露健康風險。若能夠證實多介質模式推估結果與實際檢驗結果相近，則可考慮以模擬方式取代現行樣品檢測方法，以降低風險評估成本並即時取得風險。本研究參照美國加州環境保護局(California Environmental Protection Agency, CalEPA)在2003年公告、2015年更新之空氣中有毒物質熱點計畫風險評估指引(Air Toxics Hot Spots Program Risk Assessment Guidelines)之多介質模式，搭配台灣本地參數進行部分調整，模擬重金屬由空氣、土壤進入蔬菜中導致之人體暴露健康風險。本研究以中台灣的龍井與后里兩地為研究區域，分成空氣模擬組、土壤模擬組以及蔬菜實測組三組分別進行風險討論。
攝食致癌風險以蔬菜實測組之結果看來，在后里和龍井地區都大於10^-4而需要關注致癌風險。而其中最主要貢獻致癌風險的金屬種類為砷。攝食非致癌風險以蔬菜實測組之結果來看，在后里地區大於1、在龍井地區略低於1，其中主要貢獻非致癌風險的金屬種類為砷，其次為汞，第三為鉛，故須關注此兩地區的蔬菜重金屬濃度問題，尤其應多針對砷、汞、鉛進行排放管制。空氣模擬組所得之非致癌風險與蔬菜實測組相差過遠，故僅適合用以觀察空氣污染趨勢，但不適合取代蔬菜實測方法。鉛、鎳、鉻、汞和砷的攝食非致癌風險與鉛的攝食致癌風險在土壤模擬組和蔬菜實測組間的差異均在10倍以內，故可以藉土壤模擬組的方式對此五種金屬進行蔬菜中重金屬污染狀況之監控，但最好搭配其他污染源排放情形，並配合當地蔬菜的定期抽驗。銅和鋅的風險則因為根部吸收因子的影響可能有過於高估的問題，故不適合用於取代實測方法；鎘則因為在土壤中濃度過低，幾乎檢測不到，所以也無法使用模擬取代實測。
風險結果的敏感度分析結果顯示，在空氣模擬組主要對風險結果造成影響的因子為攝食量和沉降濃度，敏感度約介於42-62%；土壤模擬組的風險最主要由攝食量影響，敏感度大於80%，其次為土壤中重金屬濃度，其中敏感度較高的金屬種類為銅和鋅，而體重之敏感度＜3%，因此對風險影響較小；蔬菜實測組之敏感度為攝食量＞蔬菜中重金屬濃度＞體重，其中敏感度較高的金屬為鉛、汞和砷，故最主要影響蔬菜實測組之風險之因子為攝食量和蔬菜中鉛、汞和砷之濃度。根據敏感度分析結果，蔬菜攝食量為影響風險之主要因子，因此對於有局部金屬污染源之區域應強化飲食攝食管理，避免完全食用區域性農作物，盡量分散飲食來源以降低暴露風險。

Industrial emissions may contain heavy metal particles and the pollutants will deposit into the vegetation, affecting the residents' health via ingestion. This study refers to the Air Toxics Hot Spots Program Risk Assessment Guidelines, which was announced by the California Environmental Protection Agency, to build the multiple pathway model and adjust some parameters taken from Taiwan, to estimate the concentration of heavy metals in vegetable and further to calculate the health risks. The discussion of consuming risk in metals was done in the air simulation group (ASG), the soil simulation group (SSG) and the vegetable measurement group (VMG) in Houli and Longjing areas in central Taiwan. In the VMG, the carcinogenic and non-carcinogenic ingestion risk in Houli and Longjing areas require attention. Arsenic is the highest contribution to the carcinogenic risk. The metals highest contribution for the non-carcinogenic risk are arsenic, mercury, and lead. Air simulation is not suitable for replacing the vegetable measurement method. The replacement of the vegetable measurement by soil simulation seems to be workable, but it's still recommended to cooperate with the emission of other pollution source and the regular inspection of local vegetables. Copper, zinc, and cadmium are not suitable for using simulation to replace measurement. For areas with local metal pollution sources, it should enhance the consumption management to avoid consuming local crops only and dispersing the dietary source to reduce the exposure risk from consuming the locally cultivated vegetables.

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