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Emissions Tests



State Emissions Testing                   

Where currently available online, below you will find links to information on vehicle emissions standards and testing in your state -- including when vehicles must undergo emissions testing, where to have your vehicle tested, what to do if your vehicle fails an emissions test, and more.
Alabama  - No Testing Kentucky  - No Testing North Dakota  - No Testing
Alaska Louisiana Ohio
Arizona Maine Oklahoma  - No Testing
Arkansas  - No Testing Maryland Oregon
California Massachusetts Pennsylvania
Colorado Michigan  - No Testing Rhode Island
Connecticut Minnesota South Carolina  - No Testing
Delaware Mississippi  - No Testing South Dakota  - No Testing
District of Columbia Missouri Tennessee
Florida Montana Texas
Georgia Nebraska  - No Testing Utah
Hawaii  - No Testing Nevada Vermont
Idaho New Hampshire Virginia
Illinois New Jersey Washington
Indiana New Mexico West Virginia
Iowa New York Wisconsin
Kansas  - No Testing North Carolina Wyoming (PDF file)


Ohio E-Check charges $25 for a Tailpipe Test - performed on a dynamometer. 
The vehicles are Dyno'd at a constant speed between 24 and 26 mph in a simulation of actual driving conditions. 
This is the most expensive test they have to offer.


  • These tests were taken at the tailpipe of the vehicles.
  • Tests may include a "Visual Inspection" for signs of tampering with emissions sensors.
  • Tests may include testing for gas cap leaks.
  • CO tells us about the ratio of fuel to air, basically richness or leanness.
  • HC tells us how much of the available fuel was NOT burned. High HC is the result of incomplete burning of the fuel mixture. High HC can result from anything causing incomplete combustion.
  • O2 tells us how much oxygen is left over. O2 emissions should be fairly stable until the air/fuel ratio goes above 14.7:1, then they rise quickly. That makes O2 a good indicator of a lean condition.
  • CO2 measured before the catalyst is a measure of combustion efficiency. High CO2 is a good indication of combustion efficiency, and CO2 readings will peak when the air fuel ratio is at its highest efficiency.


2002 GMC V8 Engine

HHO Generator was supplying about 400 ML Per Minute

Before HHO was added

Operating on HHO


Emissions tests performed on a 1997 Dodge RAM 360 V8


Ohio - Limits
O2 %   0.81   0.31 N/A  (Oxygen)
CO2 %   14.8   15.2 N/A  (Carbon Dioxide)
HC ppm   103   01 126  (Hydrocarbons - parts per million)
CO %   0.42   0.01 1.38  (Carbon Monoxide)
COK %   0.41   0.00 (Corrected Carbon Monoxide)
NOX ppm   N/F   N/F 1106.0  (Nitrogen Oxide)
Lambda   1.023   1.014 N/A





Page Last Edited - 04/03/2022

    Copyright 2003   All rights reserved.   Revised: 04/03/22.                                             Web Author, David Biggs
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