Browse Publications Technical Papers 720124
1972-02-01

Effect of Laboratory Ambient Conditions on Exhaust Emissions 720124

A program was conducted to determine the effect of temperature and humidity on exhaust emissions from automotive engines. The objective was to determine if the effects were of sufficient magnitude to require the application of correction factors to measured exhaust emissions to standard humidity and temperature values. Both American and foreign-made vehicles were tested at 20 combinations of ambient temperature and humidity.
The effect of temperature and humidity was found to be both unpredictable and of little significance for hydrocarbon and carbon monoxide emissions. No correction factors were developed for these exhaust gas constituents.
The effect of temperature was found to be of little significance for oxides of nitrogen. However, humidity effects were found to be significant and predictable for oxides of nitrogen. A correction factor was developed to correct oxides of nitrogen to a standard humidity value and was subsequently incorporated into the federal test procedure for determining automotive exhaust emissions.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Humidity Effects on Engine Nitric Oxide Emissions at Steady-State Conditions

700467

View Details

TECHNICAL PAPER

Effect of Inlet Air Humidity and Temperature on Diesel Exhaust Emissions

730213

View Details

TECHNICAL PAPER

Influence of Time-Alignment on the Calculation of Mass Emissions on a Chassis Rolls Dynamometer

2003-01-0395

View Details

X