Polycyclic aromatic hydrocarbons (PAHs) have a ubiquitous presence in nature and are among the first atmospheric pollutants to be suspected of having carcinogenic and mutagenic nature. For the present study, five representative sites for 16 PAHs were selected for ambient air sampling in Delhi. The concentration of a total of 16 particulate-phase PAHs at all sites was found to be in the range from 30.04 to 222.94 ng/m³ during the sampling period. The concentration of particulate TPAHs was found to be in order as Mukherjee Nagar > Anand Vihar > Rohini > CP > JNU during the sampling period. The mean concentration of gaseous-phase TPAHs at all sites was found to be in the range from 30.16 to 80.16 ng/m³. The mean concentration of gaseous TPAHs was found to be in order as CP > Rohini > Anand Vihar > Mukherjee Nagar > JNU. The health risk values both gaseous- and particulate-PAHs varied from 3.42 × 10⁻⁶ (JNU) to 4.96 × 10⁻⁶ (Rohini) and 3.43 × 10⁻⁵ (JNU) to 7.43 × 10⁻⁵ (Mukherjee Nagar) for child and adult respectively. The results of the diagnostic ratio, principal component analysis (PCA), and correlation at different residential sites in Delhi indicated that fossil fuel (diesel and gasoline) and wood burnings were major contributors of total PAHs in all seasons.

多环芳烃（PAH）在自然界中普遍存在，并且是最早被怀疑具有致癌和诱变性质的大气污染物之一。在本研究中，为德里的16个多环芳烃选择了五个代表性地点进行环境空气采样。在采样期间，在所有站点上总共发现了16种颗粒相PAHs的浓度在30.04至222.94 ng / m ³的范围内。发现在采样期间，颗粒TPAH的浓度依次为Mukherjee Nagar> Anand Vihar> Rohini> CP> JNU。发现所有位置的气相TPAH的平均浓度范围为30.16至80.16 ng / m ³。发现气态TPAH的平均浓度依次为CP> Rohini> Anand Vihar> Mukherjee Nagar> JNU。气态和颗粒态PAHs的健康风险值分别为3.42×10 ^-6（JNU）至4.96×10 ^-6（Rohini）和3.43×10 ^-5（JNU）至7.43×10 ^-5（Mukherjee Nagar）儿童和成人分别。诊断比率，主成分分析（PCA）以及德里不同居民点之间的相关性表明，化石燃料（柴油和汽油）和木材燃烧是所有季节总PAH的主要贡献者。