Trinity Consultants

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Sierra Research, Inc, was founded in 1981 and is a leading consulting firm in the field of air quality and air pollution control. The company provides government and private-sector clients with a wide range of engineering, testing, modeling, analytical, and regulatory compliance services related to air quality and air pollution control. Our experience ranges from assisting businesses with air quality permits, to designing vehicle emissions inspection programs to providing more basic research and analysis related to emission control measure development analysis related to air quality for government agencies. Our staff includes individuals with training in the fields of automotive engineering, mechanical engineering, chemical engineering, environmental engineering, civil engineering, atmospheric science, meteorology, chemistry, biology, and law. Sierra is headquartered in Sacramento, California, and also has an office in Ann Arbor, Michigan. Our Sacramento office has a vehicle testing and research laboratory available for projects involving the inspection, modification, or instrumentation of motor vehicles. A vehicle test cell with a chassis dynamometer and emissions testing equipment provides the capability to test a wide range of motor vehicles in a temperature-controlled environment.