The farm land next adjacent to my home is now under residential development. For the past year, we have been "treated" to a dynamite blast every day at 2:00 - including massive clouds of dust that cover everything. Looks like old pictures from the 1950s days. I also have allergies. So, I've been on medications, shots, vacuum twice daily, change the HVAC filters twice a month and keep the dogs really clean. But, the most relief I've gotten from all this is from my purchases of a 75i and a 45i. The dust level is down to almost nothing and I can breathe. Like I said, "Greatest thing since sliced bread."