H-D Systems provides detailed analytical support to clients requiring information on the emission and air quality impacts of new emission standards and various motor fuel formulations. Traditionally, the so-called “criteria pollutants” of hydrocarbons, carbon monoxide, oxides of nitrogen and particulate matter have been the focus of our emissions technology analyses. More recently, greenhouse gas (GHG) emissions have become a focus of activity in most of the developed world and fuel economy improvement is a prominent part of GHG emissions reduction.

As criteria pollutant emissions standards approach very low levels in the developed world, there is much interest in the developing world to seek cost effective methods to reducing their own criteria pollutant emissions. H-D Systems staff has been active in India, Mexico, Thailand and the Republic of China in a range of projects to reduce emissions. Among these projects, a study to reduce emissions from small two-wheelers in Asia (that was sponsored by the World Bank) came up with several low cost strategies to reduce emissions, and many of these have been adopted in South Asia since our report was released about 10 years ago. Diesel emissions have also been a major concern in both the developed and developing world, and H-D Systems staff was involved in the “DIESEL” project in Bangkok where in-use buses were emissions tested and repaired to meet standards.

Many manufacturers are planning to introduce light duty diesels in North America where the stringent emissions standards have been difficult to attain with a diesel engine. H-D Systems completed several cost studies for diesel emission control under contract to Federal Agencies. The complexity of the system is shown below for Honda’s diesel engine to meet US emission standards.