Classify the following topic as either technology, business, travel, or sports
Diesel emission standards
The topic "Diesel emission standards" is classified under technology and business.
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the following topic as either technology, business, travel, or sports

### Input:
Diesel emission standards

### Output:
The topic "Diesel emission standards" is classified under technology and business.