Option 1 states that diesel engines produce a large quantity of carbon monoxide at both lower and high temperatures. This statement is incorrect. While diesel engines do produce carbon monoxide, the quantity of carbon monoxide emitted does not necessarily increase with higher temperatures.

Option 2 states that diesel engines produce a large quantity of nitrogen oxides at both lower and high temperatures. This statement is incorrect. Diesel engines do produce nitrogen oxides, but the quantity emitted may vary depending on factors other than temperature.

Option 3 states that diesel engines produce a large quantity of carbon monoxide at lower temperatures and nitrogen oxides at high temperatures. This statement is correct. Diesel engines tend to produce higher levels of carbon monoxide at lower temperatures and higher levels of nitrogen oxides at higher temperatures.

Option 4 states that diesel engines produce a large quantity of nitrogen oxides at lower temperatures and carbon monoxide at high temperatures. This statement is incorrect. Diesel engines generally produce higher levels of nitrogen oxides at higher temperatures, not lower temperatures.

In conclusion, option 3 is the correct statement as it correctly represents the emissions of carbon monoxide and nitrogen oxides from diesel engines at different temperatures.