Study on Airborne Heavy Metals in Industrialized Urban Area of Delhi, India

摘要: This study assessed the concentrations of airborne heavy metals (HMs) in particulate matter with a cutoff size 10 µm (i.e., PM10) an industrialized urban area (Naraina Industrial Area) New Delhi, India. The samples were collected from January to December, 2011. annual mean selected HMs as follows As (0.002 ± 0.002), Cd (0.030 ± 0.020), Co (0.003 ± 0.002), Cr (0.170 ± 0.081), Cu (0.183 ± 0.120), Fe (4.774 ± 1.889), Mn (0.258 ± 0.145), Ni (0.170 ± 0.146), Pb (0.345 ± 0.207) and Zn (1.806 ± 1.042) µg/m3. seasonal trend for followed order postmonsoon > winter > premonsoon > monsoon. Principal component analysis-multiple linear regression (PCA-MLR) suggested three major emission sources: industrial (70 %), mobile stationary combustion sources (16 %), suspended/re-suspended dust (14 %). Mean PM10 exceeded both 24-hour Indian National Ambient Air Quality Standards (NAAQS) 60 100 µg/m3, respectively, all four seasons. Delhi ambient air also 24-h NAAQS 0.020 µg/m3 during 0.50 µg/m3 only post monsoon season. high levels Ni- Pb-contaminated would appear present possibility significant health risks.