Lonley1 thank you for the corrected version. I was little bit confused with the link provided by Arnico.. I am very happy with this type of initiation by Arnico. we can share the informations like this. For me i really found it fruitful. As i have prepared mini report on PM10 of kathmandu valley based on the data provided by former Ministry of Population and Environment.... Again i would like to thank Arnico for sharing it .......