EVERYONE EVERYWHERE should take precautions when changing filters, vacuum bags and cutting grass or using a blower outside.
1) All Filters should be carefully placed into a empty trash bag and sealed before moving (even 1 step) from the area...
...If you can imagine the thousands upon thousands of tiny particles coming off these ac filters as you walk through the house with them you are already doing this.
2) Vacuum bags should ALWAYS be changed outside of the living area and cover the hole in the bag where the dust enters with a damp paper towel before placing it in a plastic trash bag. Use ONLY HEPA approved bags.
3) A P100 mask should be worn when cutting grass and blowing outdoor debris.
http://www.homedepot.com/p/3M-Lead-Pain ... 5yc1vZc5c7==================
These are the three most dangerous potential exposure activities that the average person will engage in at home.
Good luck and stay alert...