1. Are there government or other regulatory standards for what constitutes hazardous vs nonhazardous, or less hazardous nanowaste, and at what concentration does the hazardous waste become so? Could less hazardous become more hazardous if there's enough of it?

2. Has anyone looked at the effects of breathing in, ingesting, or otherwise taking nanoparticles in for all living creatures in an environment, whether by primary or secondary means?