Clareview Station
A CN freight train passes Clareview Station, covering everyone in the area with diesel exhaust. :-(  

The DOC emissions control devices are made for a specific purpose. This is to reduce the amount of diesel pollutants that are released into the atmosphere by diesel powered vehicles.

DOC is an acronym for Diesel Oxidation Catalyst and is the mechanism in which the toxic pollutants are chemically altered so their removal as less harmful substances is made possible from the gases and particulate matter of the exhaust fumes.


The Diesel Exhaust Filter is a device that is now becoming standard equipment on new diesel powered vehicles. For some the name is misleading. The actual name of the device in use today is called the Diesel Particulate Filter or DPF. This is the filter that removes 85% to 100% of the solid particulates that are produced by the combustion of the diesel fuel.

Why most assume the names are interchangeable is because the DPF removes the visible pollutants so it is interpreted as being filtered. While this is true, the nitrous oxides, carbon monoxides and other gases are still present and not being filtered as the DEF would lead someone to believe.

2008 Kenworth, Cummins Diesel

The purpose of the closed crankcase ventilation system on your vehicle is to remove 100% of the crankcase emissions that are generated while it is in an operating mode from escaping into the atmosphere. This has several different advantages. First there is no release into the atmosphere of these gases so the passenger compartment is not exposed to these toxic fumes. It also helps in improving the fuel efficiency of the engine by recycling the unburnt fuel back into the combustion chambers to capture and use what would have been escaped energy.



The Purimuffler is an exhaust device that not only reduces the noise being produced by the diesel engine it is attached to, but also reduces the particulate matter and other pollutants that are being created by the combustion of the fuel.

Just like most other mufflers, the Purimuffler has a honeycomb design to its interior in which the exhaust gases have to flow before existing the end of the device. The main difference this exhaust device has over others noise silencing products is that it is coated with a catalyst. This catalyst is key to chemically altering the pollutants that are trapped by the device and reducing the emissions that exit the exhaust pipe.

May you have a great ECOLOGIC weekend

The EPA Emissions limits for diesel trucks in 2011 are mainly unchanged from 2010. With the republicans taking over the legislative house, no new restrictions or lowering of the limits on any component of the diesel exhaust is expected.

The new leader of the House Science Committee has made his priority of global freezing clear that it will be on cleaning up Climategate. Yes, new leader is named Ralph Hall and he refers to the problem of the buildup of man-made greenhouse gases as global freezing instead of global warming. This leads most experts in the environmental field to accept to be on the defense all year, which will allow for no time for progression of new or tougher restrictions in the foreseeable future.



The need for a truck exhaust filter has been around since the first person at a traffic light, who was behind a diesel powered truck, had to breathe the black soot that emanated from the tail pipe as it left from the stop. The biggest problem was no one wanted to hurt the efficiency of the engine in order to curb the amount of emissions that were being generated.

There have been technological advances since the early days of the diesel powered trucks, and their black smoke billowing from the tail pipes is no longer a requirement for a smooth running engine. This new technology has developed the diesel particulate filter (DPF).

Diesel smoke from a big truck.

Image via Wikipedia

The exhaust emissions are a concern of all Americans. We see them from the power plants we pass on the roads and, of course, the diesel trucks that plow the highway. The government says it is working on reducing all emissions but as a consumer, we have little control or influence on the results for most of the sources.

Rudolf Diesel's 1893 patent on his engine design

Image via Wikipedia

We were asked How does DPF work in trucks?  It is a relatively simple process. It is the removal of the particles from the exhaust that are produced when a fossil fuel is burned in an internal combustion engine. What makes this process more complicated is to successfully remove the particles without the performance of the diesel engine being adversely affected.

Environmental journalism supports the protecti...

Image via Wikipedia

The Purimuffler exhaust system is the response by Ward Clean Air Products to the requirements set by the EPA for the reduction of harmful emissions of diesel powered vehicles.

Ever since the Clean Air Act was first passed back in 1963, the manufacturing world has had to address the problem of the quantity of pollutants their trucking fleets have produced.  In 1990, this federal act was amended to better address the problems of acid rain, ozone depletion, and toxic air pollution. From this point forward, many businesses have specialized in helping these fleets reduce their emissions.

Diesel Exhaust Emissions

Image by PNNL - Pacific Northwest National Laboratory via Flickr

The terms diesel emmission filter and diesel emission filter are both being used in the search engines when people are in search of this topic. While not everyone can be a great speller, every diesel powered vehicle can have their emissions reduced with the use of the diesel particulate filter (DPF).

This device was developed for the sole purpose of reducing the amount of solid material from reaching the end of the exhaust system on a diesel powered vehicle. This solid material is in the form of soot and other fine particles that are suspended in the exhaust gases when it leaves the combustion chamber of the engine.


The federal emission control grants are still available for fleet owners and others that wish to or need to reduce the amount of emissions their diesel powered vehicles are producing while they are on the road.

The official name of this program is the National Clean Diesel Campaign (NCDC) for the US government. This is so the vehicles on the road can meet the standards set by the Diesel Emissions Reduction Act (DERA) that was passed in 2005.


Using a closed crankcase ventilation (CCV) system on your diesel powered truck is a crucial way that helps to contribute to the reduction of emissions that your vehicles generates.

The CCV system is necessary to stop the blow-by from escaping into the atmosphere from the cylinders. This blow-by consists of the same gases that are traveling down the exhaust system. The blow-by is a very small amount of the gases that leak by the compression rings on each cylinder during the ignition cycle of the engine.

The following video is what you do not want in your diesel truck engine compartment or cab.


The disposable DPF is a useful tool for a fleet owner to use that will quickly reduce the emissions of their trucks.


The amount of soot and other particulate matter that is removed from the exhaust fumes is dependent on whether or not the DPF is the only pollution-reducing device on the truck. If it is a standalone unit, then up to 85% of all soot and particulate matter can be removed. If paired with other devices, a near 100% reduction can be achieved.


The presence of diesel truck exhaust as a pollutant is well known, felt and seen on a regular basis by people in the urban and rural areas alike. The reason is because the use of the diesel engine is widespread in our civilization since it is the most efficient means of producing raw power to move items too heavy for manual labor.

Most people are well aware that diesel engines are the power plants behind the tractor trailers that are plowing down the highway. These are highly visible since they are seen nearly all the time, 24 hours a day.


Do you know about the NYSERDA grants?  The New York State Energy Research and Development Authority has funding available to help pay for the necessary filters to install on your diesel vehicles.


You know that you should have clean air filters on your diesel engines.  As you read these articles on you realize just how important it is to be responsible and to help clean the environment of soot and hazardous chemicals from diesel exhaust.

The Diesel Particulate Filter (DPF) is a much needed device.  With the equipment that Ward manufactures for cleaning particulate matter you will have a selection of devices for reduction in carbon monoxide, VOCs, and nitrogen oxides.


The commonality between an emission filter, diesel truck and fuel efficiency is that fewer pollutants are released into the atmosphere. Each one of these components in what used to be the producers of the large black clouds of soot that emanated from the exhaust pipes are slowly going away.

The technology is available for cleaner, more fuel-efficient diesel engines. This is thanks to the diesel vehicle and engine manufacturers. Where the notable problem lies for the public is in the life expectancy of these behemoth vehicles that are on the road.


The EPA and Reduction of Soot in 2010 is just one of the focuses of this governmental agency. There are many reasons soot or particulate matter is such a concern. Not only is it unhealthy to breathe, but it is causing environmental damage that is becoming apparent in places never thought of before.


Some people have asked about DPF filter, how do they work? The reason this question is being asked so much is because there is a noticeable change in the exhaust from the large diesel powered trucks people are seeing on the road. The newer trucks no longer have that huge puff of black smoke when they take off from a stop or upon acceleration.

The reason the puff of smoke is gone is due to the development of the diesel particle filters.  These filters look much like mufflers on the inside. These are walled chambers where the soot and other particles are deposited. The walled chambers are used because the flow of the exhaust gases cannot be impeded too much or the performance of the engine would be reduced.


For modern truck exhaust safety procedures to be implemented, the emissions are what have to be considered and dealt with properly. This has to include both the soot or particulates and the gases that emanate from operating a diesel engine.

The black soot that is expelled from the exhaust pipes of a diesel powered truck is more than just a nuisance; it is a health concern to the people that are exposed to it. These fine particulates contain toxic chemicals that are now airborne. Because they are airborne, it is easily inhaled by anyone near the black soot cloud when it bellows out of the pipe.


The term engine emissions are any particle or component which includes gas, liquid and solids, that emanate from an internal combustion engine when it is operating.

The concern is on the harmful components that this includes. Some might point out that water is one of the components, but this is only harmful to the steel exhaust system and not the environment. The focus of all the research and studies on diesel emissions are the harmful components that can have an adverse effect on human health.

The majority of the harmful components of the diesel engine’s emissions are carbon monoxide, volatile organic compounds, nitrogen oxides and particulate matter.


Ward Clean Air Products

Ward Clean Air Products

Ward Clean Air Products Can help you with all of the following: NYSERDA Grant Money Federal Grant Money CCV Systems Diesel Oxidation Catalyst (DOC) Diesel Particulate Filter (DPF) Alternative Fuel Products Terminox™ Exhaust Accessories COMBICLEAN™ Back Pressure Monitor Air Intake accessories FILTER CLEANER Removable Insulation Blankets Request a Quote: