How can weather conditions influence vehicle emissions tests?

Weather conditions significantly influence vehicle emissions tests, and one of the key factors is how humidity and temperature can impact the performance of emissions systems. The efficiency of emissions control systems, such as catalytic converters, can vary with changes in temperature and humidity. For instance, warmer temperatures can enhance the chemical reactions needed for these systems to reduce pollutants effectively. Conversely, high humidity can also affect the combustion process and the formation of emissions.

This interplay means that testing conducted under varying climatic conditions could yield different results, revealing why it is essential to consider these factors when evaluating a vehicle's emissions performance. Inconsistent results may arise from a failure to account for these environmental variables during testing.