Polycyclic Aromatic Hydrocarbons (PAHs) are potential carcinogenic air components with sources associated with incomplete combustion and related activities. Although such activities are dominant in Nigeria urban space; hitherto, there are limited atmospheric studies on PAHs. The present study investigated air PAHs in Nigeria mega city. ∑₁₅PAHs concentrations generally range from 24 ng/m³ (in residential area of Ketu) to 110 ng/m³ (in industrial centre of OSH). The concentration ratio of industrial (Oshodi) location to residential (KTU) location was observed to be ~4. General seasonal trend was not observed as seasonal variation was location specific, however OSH highest concentrations were observed in the dry season (October–December) with 3–5 membered ring having a potential influence on three other locations (Agege, Ikeja and Apapa) in the dry period. Impact of a dumpsite explosion on the atmosphere was observed in a proximate location. Relatively high exposure risk was observed at Yaba and Oshodi though still within the low risk boundary. In general, Lagos air PAHs cancer risks evaluated with two risk models indicated: (1.8–9.7) × 10⁻⁵ and (0.23–1.2) × 10⁻⁶ respectively. To the best of our knowledge, this report provides the first full data on air PAHs concentrations in Nigeria and highlights the influence of industrial cores on residential locations.

多环芳烃 (PAH) 是潜在的致癌空气成分，其来源与不完全燃烧和相关活动有关。尽管此类活动在尼日利亚城市空间中占主导地位；迄今为止，关于多环芳烃的大气研究有限。本研究调查了尼日利亚大城市的空气多环芳烃。∑ ₁₅多环芳烃的浓度范围通常为 24 ng/m ³（在克图居民区）到 110 ng/m ³（在职业安全与卫生工业中心）。观察到工业（Oshodi）位置与住宅（KTU）位置的集中比为~4。没有观察到一般的季节性趋势，因为季节性变化因地点而异，但是在旱季（10 月至 12 月）观察到职业安全与卫生最高浓度，其中 3-5 元环对其他三个地点（Agege、Ikeja 和 Apapa）有潜在影响枯水期。在附近的位置观察到垃圾场爆炸对大气的影响。尽管仍在低风险范围内，但在 Yaba 和 Oshodi 观察到相对较高的暴露风险。一般来说，拉各斯空气中多环芳烃癌症风险评估有两个风险模型表明：(1.8–9.7) × 10 ^-5和 (0.23–1.2) × 10 ^-6分别。据我们所知，这份报告提供了尼日利亚空气中多环芳烃浓度的第一个完整数据，并强调了工业核心对住宅区的影响。