M. Zavala, S. C. Herndon, R. S. Slott, E. J. Dunlea, L. C. Marr, J. H. Shorter, M. Zahniser, W. B. Knighton, T. M. Rogers, C. E. Kolb, L. T. Molina, and M. J. Molina Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA Center for Atmospheric and Environmental Chemistry, Aerodyne Research Inc., Billerica, Massachusetts, USA...

Indoor nitrogen dioxide (NO₂) concentration is an important factor for personal exposure despite the wide distribution of its sources. Exposure to NO₂ may produce adverse health effects. The aims of this study were to characterize the indoor air quality of wayside shops using multiple NO₂ measurements, and to estimate the contribution of outdoor NO₂ sources such as vehicle emission to indoor ai...

Atmospheric aerosols have been shown to be an important input of organic carbon and nutrients to alpine watersheds and influence biogeochemical processes in these remote settings. For many remote, high elevation watersheds, direct evidence of the sources of water soluble organic aerosols and their chemical and optical characteristics is lacking. Here, we show that the concentration of water sol...

Since 1970, vehicle’s exhaust pollutions have received increasing attention as a source of air pollution at both local (human health concerns) and global (global warming) scales. This study mainly discusses diesel and gasoline vehicles because, today, over 90% of vehicles on the road use gasoline and diesel fuels. The major concerns of gasoline exhaust contaminants are carbon monoxide (CO), hyd...

Advances in vehicle design and fuel quality mean cars can be made cleaner and more efficient. Lower emissions of carbon monoxide (CO), nitrogen oxides (NOx), sulphur dioxide (SO2), particles (including the fine dust and soot PM10) and hydrocarbons (HCs) also known as volatile organic compounds (VOCs) will lead to better urban air quality and less summertime smog. Lower emissions of carbon dioxi...

The purpose of this study is to investigate hot spots along roadways where high values of emissions are observed based upon real-world, on-road vehicle emissions measurements. A portable instrument, the OEM-2100 manufactured by Clean Air Technologies International, Inc., was used to measure on-road tailpipe emissions of carbon monoxide (CO), nitric oxide (NO), hydrocarbons (HC), and carbon diox...

● Emissions of NOx have fallen by 37% from 1990 to 2000. This has been mainly due to reductions in emissions from road transport and public power generation. ● Road transport is the largest source of NOx emissions in the UK, contributing 49% of total emissions in 2000. However, emissions from road transport have fallen by 34% between 1990 and 2000 due to improvements in engine design and fittin...

Article history: Received 18 June 2014 Received in revised form 11 December 2014 Accepted 29 December 2014 Available online 4 May 2015

Not to be confused with emission spectroscopy, the detection of mobile source emissions by means of a remote sensing device (RSD) is almost entirely an application of absorption spectroscopy. In this article we discuss its application to the measurement of individual vehicle emissions remotely as the vehicle drives by in its normal driving mode. Most studies and commercial implementation have i...