Measurement of diesel engine emissions

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code to determine a first load of an engine;
• code to determine an exhaust flow of the engine for the first load;
• and
• code to calculate a quantity of a chemical emitted from the engine based, in part, on the load, the exhaust volume, and a density of the chemical.

An apparatus, comprising:

• a power meter coupled to an output of an engine;
• an engine monitor coupled to the engine;
• a memory;
• and
• a processor coupled to the power meter, coupled to the engine monitor, and coupled to the memory,
• in which the processor is configured:
• to determine a first load of the engine from the power meter;
• to determine an exhaust flow of the engine from the engine monitor;
• and
• to calculate a quantity of a chemical emitted from the engine based, in part, on the first load, the exhaust flow, and a density of the chemical.