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MSHA -  Title 30 CFR
30 CFR § 72.502 Requirements for nonpermissible light-duty diesel-powered equipment other than generators and compressors.

    (a) Each piece of nonpermissible light-duty diesel-powered equipment (as defined by § 75.1908(b) of this chapter), other than generators and compressors, introduced into an underground area of an underground coal mine after March 20, 2001 must not emit no more than 5.0 grams per hour of diesel particulate matter.
   (b) A piece of nonpermissible light-duty diesel-powered equipment must be deemed to be in compliance with the requirements of paragraph (a) of this section if it utilizes an engine which meets or exceeds the applicable particulate matter emission requirements of the Environmental Protection Administration listed in Table 72.502-1, as follows:

Table 72.502-1
EPA requirement EPA category PM limit
40 CFR 86.094-8(a)(1)(i)(A)(2)..............
40 CFR 86.094-9(a)(1)(i)(A)(2).............
40 CFR 86.094-11(a)(1)(iv)(B)...............
40 CFR 89.112(a).................................

light duty vehicle..................................
light duty truck.....................................
heavy duty highway engine....................
Tier 2 nonroad..........................
kW<(hp<11).......................................
8<kW<19 (11<hp<25).................
19<kW<37 (25<hp<50)........................
37<kW<75 (50<hp<100)......................
75<kW<130 (100<hp<175)..................
130<kW<225 (175<hp<300)................
225<kW<450 (300<hp<600)................
0.1 g/mile.
0.1 g/mile.
0.1 g/bhp-hr.
varies by power range:
0.80 g/kW-hr (0.60 g/bhp-hr).
0.80 g/kW-hr (0.60 g/bhp-hr).
0.60 g/kW-hr (0.45 g/bhp-hr).
0.40 g/kW-hr (0.30 g/bhp-hr).
0.30 g/kW-hr (0.22 g/bhp-hr).
0.20 g/kW-hr (0.15 g/bhp-hr).
0.20 g/kW-hr (0.15 g/bhp-hr).
Notes:
"g" means grams.
"hp" means horsepower.
"g/bhp-hr" means grams/brake horsepower-hour.
"kW" means kilowatt.
"g/kW-hr" means grams/kilowatt-hour.


   (c) The requirements of this section do not apply to any diesel- powered ambulance or fire fighting equipment that is being used in accordance with the mine fire fighting and evacuation plan under § 75.1502.