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:
(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:
w is the percentage of total heat input derived from lignite,
x is the percentage of total heat input derived from gaseous fossil fuel,
y is the percentage of total heat input derived from liquid fossil fuel, and
z is the percentage of total heat input derived from solid fossil fuel (except lignite).
(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.