This study compares emissions from Euro VI-D Diesel and CNG buses across temperatures
from− 7° C to 35° C. Pollutants including NOx, THC, CH 4, CO, NH 3, N 2 O, HCHO, Solid …

This study assessed the real-world emissions from two heavy-duty natural gas vehicles
certified to the optional 0.02 g/bhp-hr nitrogen oxides (NOx) standard and one diesel vehicle …

The current study characterized nitrogen oxide (NOx), nitrous oxide (N 2 O), and ammonia
(NH 3) emissions from 14 heavy-duty vehicles from different vocations (school bus, transit …

Ammonia emissions from gasoline vehicles have been confirmed an essential precursor of
urban secondary aerosols. To more comprehensively understand the formation mechanisms …

On-board diagnostics (OBD) remote monitoring technology is essential for continuously
tracking emissions from heavy-duty diesel vehicles (HDDVs) in operation. However, the dew …

Reducing the differences between real-world and certificated NOx emission levels is an
important element of in-use emission surveillance programs. Therefore, investigating the …

Emissions standards describe the fuels, the procedures, and, among others, the analyzers to
be used for the measurement of the different compounds during the type-approval of heavy …

Three-way catalyst (TWC) stands as the state-of-the-art technology for controlling emissions
in natural gas vehicles, but its utilization can generate NH3 by-product. This study proposed …

We used a heavy-duty chassis dynamometer to measure gaseous and particulate emissions
from natural gas and diesel-powered yard tractors tested on different driving cycles, some …

Diesel engines are a major source of air pollution in California. The California Air Resources
Board (CARB)'s Truck and Bus Regulation has accelerated the introduction of exhaust …