Standard for particulate matter.
40 C.F.R. § 60.402
in effect(a) On and after the date on which the performance test required to be conducted by § 60.8 is completed, no owner or operator subject to the provisions of this subpart shall cause to be discharged into the atmosphere:
(1) From any phosphate rock dryer any gases which:
(i) Contain particulate matter in excess of 0.030 kilogram per megagram of phosphate rock feed (0.06 lb/ton), or
(ii) Exhibit greater than 10-percent opacity.
(2) From any phosphate rock calciner processing unbeneficiated rock or blends of beneficiated and unbeneficiated rock, any gases which:
(i) Contain particulate matter in excess of 0.12 kilogram per megagram of phosphate rock feed (0.23 lb/ton), or
(ii) Exhibit greater than 10-percent opacity.
(3) From any phosphate rock calciner processing beneficiated rock any gases which:
(i) Contain particulate matter in excess of 0.055 kilogram per megagram of phosphate rock feed (0.11 lb/ton), or
(ii) Exhibit greater than 10-percent opacity.
(4) From any phosphate rock grinder any gases which:
(i) Contain particulate matter in excess of 0.006 kilogram per megagram of phosphate rock feed (0.012 lb/ton), or
(ii) Exhibit greater than zero-percent opacity.
(5) From any ground phosphate rock handling and storage system any gases which exhibit greater than zero-percent opacity.
Source: ecfr_bulkFetched: 7/26/2026
Source: eCFR APIURL: https://www.ecfr.gov/api/versioner/v1/full/2024-07-01/title-40.xml?part=60Fetched: 5/31/2026