With all the pollen and other particles in the air outside there is no way to prove it's from inside the house. 

Opening a unit and dumping out debris makes no sense, as particles become airborne.Another tip, don't use a shop vac for cleaning out fireplace ash... there are special vacs to that.

You know, misaligned particle board/paper cabinets, dust and dirt in the floor finishes, caulking filling 2 inch gaps in the vinyl siding and blackjack all over the roof where the flashing should be...I call it Menarded

True, but the boxes are really cheap particle board.

For our rental kitchens, we just make sure to get plywood frames (no particle board, as it will be destroyed when it gets wet).

Lint will make it by the 1st screen and build up from very small particles that were not caught.

The main entrance is two doors wide, there's a door on one side, and a sheet of particle board on the other!

And if the grass is long and/or wet, the openings at the bottom can become clogged thus preventing the product from falling out onto the grass.Now the broadcast spreaders cover a wider swath with each pass, but the edges of that are determined by how fast the user is moving and by how heavy the particle grains are.

Let's see, a car maker can build a car that blows up or won't stop and they are allowed to continue building them because the human loss estimated is accepted based on the economic benefits, but the potential of having air borne lead particles from less than a two inch area around a door frame is a greater threat to public safety and is more economically feasible to contain?

These are good because they are not as affected by wind and won't blow back in your face and also don't fill up a room with aerosol mist.Do not let our inate urge to be polite allow you to become a victim.