Pre and Post-Monsoon levels of ambient SO₂, NO₂, PM_2.5 and the trace metals Fe, Cu, etc. were measured at industrial and residential regions of the Kochi urban area in South India for a period of two years. The mean PM_2.5, SO₂ and NO₂ concentrations across all sites were 38.98 ± 1.38 µg/m³, 2.78 ± 0.85 µg/m³ and 11.90 ± 4.68 µg/m³ respectively, which is lower than many other Indian cities. There was little difference in any on the measured species between the seasons. A few sites exceeded the NAAQS (define acronym and state standard) and most of the sites exceeded WHO (define acronym and state standard) standard for PM_2.5. The average trace metal concentrations (ng/m³) were found to be Fe (32.58) > Zn (31.93) > Ni (10.13) > Cr (5.48) > Pb (5.37) > Cu (3.24). The maximum concentration of trace metals except Pb were reported in industrial areas. The enrichment factor, of metals relative to crustal material, indicated anthropogenic dominance over natural sources for the trace metal concentration in Kochi’s atmosphere. This work demonstrates the importance of air quality monitoring in this area.

对印度南部高知城区工业区和住宅区进行了为期两年的季风前后环境SO ₂、NO ₂、PM _2.5和微量金属Fe、Cu等浓度的测量。所有地点的PM _2.5、SO ₂和NO ₂平均浓度分别为38.98 ± 1.38 µg/m ³、2.78 ± 0.85 µg/m ³和11.90 ± 4.68 µg/m ³，低于许多其他印度城市。不同季节之间测量的物种几乎没有差异。少数场所超过了 NAAQS（定义缩写和国家标准），大多数场所超过了 WHO（定义缩写和国家标准）PM _2.5标准。发现平均微量金属浓度(ng/m ³ )为Fe(32.58)>Zn(31.93)>Ni(10.13)>Cr(5.48)>Pb(5.37)>Cu(3.24)。工业区报告了除 Pb 之外的痕量金属的最大浓度。相对于地壳物质的金属富集系数表明，高知大气中痕量金属浓度的人为因素相对于天然来源占主导地位。这项工作证明了该地区空气质量监测的重要性。