Emission mandates for the mass transit industry revolve around three central issues:

• The obvious critical reduction of toxic exhaust emissions which are harmful to the health of both pedestrians and the passengers.
• Reducing these emissions within tight and fixed budgets.
• Providing an effective solution that provides ease of installation and optimizes vehicle uptime.

Fortunately, the harmful components of diesel exhaust; particulate matter (PM), carbon monoxide (CO), and hydrocarbons (HC), are easily reduced with current and readily available technologies which provide immediate emissions reductions and hence immediate health benefits to the local population.

Ward Clean Air Products offers three retrofit solutions designed with urban bus fleets in mind; which are both industry leading verified solutions*. In addition, our application engineering approach to your emission control mandate is the difference between a one-size-fits-all solution and a comfortable custom-fit solution insuring quick and easy installations:

	1. First is the diesel oxidation catalyst (DOC), available in two configurations:
		a. The AZ Purifier – offering 20-40%* reduction dependent on the vehicle
		b. AZ Purimuffler (a combined AZ Purifier catalyst and silencer solution to enhance the packaging of the DOC solution within the vehicle)
	2. The second is the Purifilter, a passively regenerating diesel particulate filter (DPF)
	3. A closed crankcase ventilation system which can be combined with either product above which will eliminate 100% of engine crankcase gases which studies have found penetrate the school bus cabin greatly impacting cabin air quality.
	These are solutions you can also feel good about, knowing your emission control dollars are serving the environment and the population well with the best verified solution in the industry*. Because particulate exposure increases exponentially with proximity to the source, reducing emissions with these retrofit technologies in the vicinity of people provides critical public health benefits and minimizes a person's exposure to these harmful emissions. The products offered by Ward Clean Air Products go through a strict testing and validation regime. WCAP holds more product certifications and verifications than our competitors. Letters of evaluation from agencies, testing results, and papers are readily available to our customers
RETROFIT EMISSION SOLUTIONS
AZ Purifier and AZ Purimuffler – Diesel Oxidation Catalyst The AZ Purifier is an oxidation catalyst that is installed upstream of the vehicles original muffler into a single integrated package. Exhaust enters the catalyst and the harmful exhaust is chemically and physically modified into harmless air. AZ Purimufflers can be designed to be a direct fit replacement for the manufacturers’ original muffler. This means less down time and less invasive installation. AZ Purimufflers are a quick and efficient way to effectively reduce harmful diesel emissions.
Purifilter- Diesel Particulatr Filter The Purifilter is a diesel particulate filter coated with a catalytic layer. Exhaust enters the filter where the particulate is "trapped". When appropriate temperatures are reached the particulate is "burned". Exhaust comes out clean and the filter continually " regenerates" or cleans itself. The Purifilter replaces the current muffler and it provides superior noise attenuation that is comparable to high grade mufflers.