ASHRAE 62-2010 and partial occupancy?

[Grawburg]

Question from someone out of the industry for a while and don't have a copy of 62-2010 to refer to....what allowances does 62-2010 give for buildings with partial occupancy?

I remember with 62-89 for 3 hours or less you could use half of the outside air, but now I think I was told that you use 3/4 number of people of the full occupancy...and this applies to office, school, church, etc...right or wrong?

[teddy bear]

Purging indoor pollutants requires an air change in 4-5 hours. ASHRAE suggest 7 cfm per occupant for non-smoking space. My take is that the one person in a space requires the space air change rate to purge indoor pollutants.
An example of 10,000 ft.^3 space requires 42 cfm of fresh air. Using the 7 cfm fresh air per person rule suggest that 1-6 occupants will get adequate fresh air. Additional occupants require an additional 7 cfm per occupant.
The fresh air requirement for homes is 7 cfm per design occupants plus 1 cfm per 100 sqft as a minimum.
It is also suggested that fresh air is not required when the space is unoccupied.
CO2 control is able to detect a single occupant in a 1,000 sqft space to activate the minimal .25 ach required to purge the indoor pollutants.
So, even one occupants should require a minimal air change rate to purge pollutants.
I am also curious about the real ASHRAE requirement.

regards TB