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G. C. Holzworth was the first to suggest a method of determining morning mixing heights over an urban area. This method, when applied to some Indian stations could not yield proper results under all circumstances and at all times. These points are thoroughly discussed in this paper. A modified method, which suits well in all seasons and to all stations in India, has been suggested by the present author. Daily urban morning mixing heights are determined based on the modified method and from that mean monthly and seasonal values are evaluated and discussed. During post-monsoon, winter and summer seasons the heights are very shallow, while they are fairly large during the southwest monsoon season The coastal regions show greater depths than the inland ones. [ABSTRACT FROM AUTHOR]