Unverified83% confidenceDecision RuleTime unknown

户外长时间徒步/丛林活动应选DEET浓度20-30%的产品以获得4-6小时持效，城市日常通勤或短时户外用10%浓度或派卡瑞丁即可，高浓度反增皮肤刺激和溶解塑料/合成纤维风险

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防虫剂category

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UnverifiedDEET浓度20-30%可提供约5-6小时防护，浓度超过30%后有效时长增幅极小，日常城市及景区选20%浓度即够用，无需盲目追求高浓度75% similar Unverified浓度与刺激性/气味成正比、与安全性成反比：日常城市通勤10-15%DEET或15%派卡瑞丁足够，30%仅用于长时间野外74% similar

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