Typical values for Earth's atmosphere 

Does anybody know typical values for n and d in the atmosphere of Earth? Is the refractive index of the particle the same as that of air (approx. 1.0003 at sea level), or is a different value to be used for a single particle? In general, it would be nice if one could use the formula along with these values to make calculations with these. Getting information via Google about this seems to be very difficult (either the information is only about the principle but without numbers or it is drowning in details or you have to pay for it or Google's hit is about a completely different topic), so it would be nice if Wikipedia could provide such useful information. If I had such information I surely would add it to the article, but unfortunately I don't have any.