ONP Grades
There are four grades of newspapers commonly recycled. According to the latest (2011) Institute of Scrap Recycling Industries (ISRI) Scrap Specifications Circular, these grades are defined as:

(6) Old NewspaperConsists of sorted newspapers and other acceptable papers as typically generated by voluntary collection and curbside collection programs.
Prohibitive Materials may not exceed 2%
Outthrows plus prohibitives may not exceed 4%
Other acceptable papers may not exceed 30%
(7) Regular News, De-ink Quality (#7 ONP)Consists of sorted, fresh newspapers, not sunburned, and other acceptable papers. This grade may contain magazines.
Prohibitive Materials may not exceed 1%
Outthrows plus prohibitives may not exceed 3%
Other acceptable papers may not exceed 20%
(8) Special News, De-ink Quality (#8 ONP)Consists of sorted, fresh newspapers, not sunburned, and other acceptable papers. This grade is to be relatively free from magazines and contain not more than the normal percentage of rotogravure and colored sections.
Prohibitive Materials may not exceed 1%
Outthrows plus prohibitives may not exceed 2%
Other acceptable papers may not exceed 10%
(9) Over-Issue News (OI or OIN)Consists of unused, overrun newspapers printed on newsprint, containing not more than the normal percentage of rotogravure and colored sections.
Prohibitive Materials None permitted
Outthrows plus prohibitives None permitted