List of 10 NPI substances that are
perceived to be of higher risk than lead
Rank 1: Oxides of nitrogen  http://www.npi.gov.au/resource/oxides-nitrogen-0
Rank 2: Chromium (VI) compounds http://www.npi.gov.au/resource/chromium-vi-compounds
Rank 3: Carbon monoxide http://www.npi.gov.au/resource/carbon-monoxide-0
Rank 4: Sulfur dioxide  http://www.npi.gov.au/resource/sulfur-dioxide
Rank 5: Dichloromethane  http://www.npi.gov.au/resource/dichloromethane
Rank 6: Cadmium and compounds http://www.npi.gov.au/resource/cadmium-and-compounds
Rank 7: Particulate matter  http://www.npi.gov.au/resource/particulate-matter-pm10-and-pm25
Rank 8:  Sulfuric acid  http://www.npi.gov.au/resource/sulfuric-acid
Rank 9: Xylenes  http://www.npi.gov.au/resource/xylenes-individual-or-mixed-isomers
Rank 10: Arsenic compounds http://www.npi.gov.au/resource/arsenic-and-compounds-0
Rank 11: Lead compounds http://www.npi.gov.au/resource/lead-compounds