Similarly, the range of average mean of I/O ratios for OC and EC were 3.80e15.89 and 4.67 to 9.85 in PM10 and 4.25 to 17.95 and 5.09 to 10.36 in PM2.5 respectively in cultural/ritual sites. I/O ratios of OC and EC were found greater than unity at all cultural/ritual indoors,which again reveals that OC and EC levels were influenced by significant indoor sources itself. In residential-indoors the I/O ratios of OC and EC were quite higher unity, indicate that the indoor sources
also make a significant contribution in indoor OC and EC levels.