SAN DIEGO COUNTY AIR POLLUTION CONTROL DISTRICT

RULE 260.44 - STANDARD FOR NITROGEN OXIDES
(Rev. Effective 1-12-79)

(a)    On and after the date on which the performance test required to be conducted by Rule 260.8 is completed, no owner or operator subject to the provisions of this subpart shall cause to be discharged into the atmosphere from any affected facility any gases which contain nitrogen oxides, expressed as NO2 in excess of:

  1. 86 nanograms per joule heat input (0.20 lb per million Btu) derived from gaseous fossil fuel or gaseous fossil fuel and wood residue.
  2. 130 nanograms per joule heat input (0.30 lbs per million Btu) derived from liquid fossil fuel or liquid fossil fuel and wood residue.
  3. 300 nanograms per joule heat input (0.70 lb per million Btu) derived from solid fossil fuel or solid fossil fuel and wood residue (except lignite or a solid fossil fuel containing 25 percent, by weight, or more of coal refuse).
  4. 260 nanograms per joule heat input (0.60 lb per million Btu) derived from lignite or lignite and wood residue (except as provided under Subsection (a)(5) of this rule).
  5. 340 nanograms per joule heat input (0.80 lb per million Btu) derived from lignite which is mined in North Dakota, South Dakota, or Montana and which is burned in a cyclone-fired unit.

(b)   Except as provided in sections (c) and (d) of this rule, when different fossil fuels are burned simultaneously in any combination, the applicable standard (in ng/J) shall be determined by proration using the following formula:

(c)    When fossil fuel containing at least 25 percent, by weight, of coal refuse is burned in combination with gaseous, liquid or other solid fossil fuel or wood residue, the standard for nitrogen oxides does not apply.

(d)    Cyclone-fired units which burn fuels containing at least 25 percent of lignite that is mined in North Dakota, South Dakota, or Montana remain subject to Subsection (a)(5) of this rule regardless of the types of fuel combusted in combination with that lignite.