The diurnal and seasonal variation of PM₁₀, SO₂, NO₂, NH₃ and water-soluble compounds were studied in Naraina industrial area; Delhi from January to December, 2017. It was observed that annual average concentrations of PM_10, SO₂, NO₂, NH_3, SO₄²⁻, NO₃⁻, NH₄⁺,Na⁺, K⁺, Ca²⁺, Mg²⁺, Cl⁻ and F⁻ in the day time were 227 ± 91, 9 ± 5, 59 ± 22, 65 ± 15, 17.45 ± 5.14, 17.60 ± 4.94, 8.66 ± 2.94, 4.05 ± 1.08, 3.46 ± 0.91, 10.38 ± 4.48, 3.15 ± 0.99, 43.06 ± 5.20 and 0.50 ± 0.12 µg m⁻³, respectively and night time were 320 ± 127, 14 ± 7, 82 ± 25, 83 ± 20, 22.64 ± 5.22, 21.66 ± 5.0, 11.81 ± 3.47, 3.29 ± 0.87, 3.02 ± 1.19, 7.55 ± 3.16, 2.49 ± 0.95, 31.86 ± 4.70 and 0.37 ± 0.12 µg m⁻³, respectively. PM₁₀ and sometimes NO₂ concentrations exceeded the Indian National Ambient Air Quality Standards. SO₂, and NH₃ concentrations were within the standard. The selected parameters varied from season to season. In the night time, selected parameters concentrations were high in comparison to day time might be due to formation of inorganic secondary particulate matters and low wind speed in the ambient air.

研究了Naraina工业区PM ₁₀、SO ₂、NO ₂、NH ₃及水溶性化合物的昼夜变化；_{德里，2017 年 1 月至 12 月。观测到 PM 10、} SO ₂、NO ₂、NH _3、 SO ₄ ^2-、NO ₃ ^-、NH ₄ ⁺、Na ⁺、K ⁺、Ca ²⁺的年平均浓度, Mg ²⁺ , Cl ^-和 F ^-白天分别为 227 ± 91、9 ± 5、59 ± 22、65 ± 15、17.45 ± 5.14、17.60 ± 4.94、8.66 ± 2.94、4.05 ± 1.08、3.46 ± 0.91、10.38 ± 4.48、3.106 ± 0.99、43。 ± 5.20 和 0.50 ± 0.12 µg m ^-3，夜间时间分别为 320 ± 127、14 ± 7、82 ± 25、83 ± 20、22.64 ± 5.22、21.66 ± 5.0、11.81 ± 3.47、3.29 ± 0.87、3.02 ±分别为 1.19、7.55 ± 3.16、2.49 ± 0.95、31.86 ± 4.70 和 0.37 ± 0.12 µg m ^-3。PM ₁₀和有时 NO ₂的浓度超过了印度国家环境空气质量标准。SO ₂和NH ₃浓度在标准范围内。所选参数因季节而异。在夜间，与白天相比，选择的参数浓度较高，这可能是由于无机二次颗粒物的形成和环境空气中的低风速。