Study on concentration of ambient NH ₃ and interactions with some other ambient trace gases

Sharma, S. K; Datta, A; Saud, T; Mandal, T. K; Ahammed, Y. N; Arya, B. C; Tiwari, M. K

Study on concentration of ambient NH ₃ and interactions with some other ambient trace gases

2010

We present diurnal variation of ambient ammonia (NH₃) in relation with other trace gases (O₃, CO, NO, NO₂, and SO₂) and meteorological parameters at an urban site of Delhi during winter period. For the first time, ambient ammonia (NH₃) was monitored very precisely and continuously using ammonia analyzer, which operates on chemiluminescence method. NH₃ estimation efficiency of the chemiluminescence method (>90%) is much higher than the conventional chemical trapping method (reproducibility 4.5%). Ambient NH₃ concentration reaches its maxima (46.17 ppb) at night and minimum during midday. Result reveals that the ambient ammonia (NH₃) concentration is positively correlated with ambient NO (r ² = 0.79) and NO₂ (r ² = 0.91) mixing ratio and negatively correlated with ambient temperature (r ² = − 0.32). Wind direction and wind speed indicates that the nearby (~500 m NW) agricultural fields may be major source of ambient NH₃ at the observational site.

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