Parts Per Million.
High Hydrocarbon (HC) emissions are almost always a sign of poor fuel ignition. Hydrocarbons are basically raw fuel. PPM (parts-per-million) is a way of quantifying small concentrations.
In measuring exhaust emissions.
Indolene is a form of gasoline used in testing because it is standardized and has no additives. Indolene gasoline is used for the US Federal Test Procedure (FTP) to certify vehicles for emissions rather than commercial gasoline. Indolene fuel used in certification typically has a sulfur content below 50 parts per million (ppm). On the other hand, commercial gasoline sulfur content ranges between 30 and 1000 ppm throughout the US with an average of about 300+/-50 ppm. Indolene gasoline results in reproducible tailpipe emissions from a test vehicle. Commercial gasoline results in a wide range of emissions. The emissions differences are attributable largely to the disparity in gasoline sulfur content. source: http://www.meca.org/galleries/default-file/sulfur.pdf http://www.futurefueltechnologies.com/?page_id=42
ppm stands for parts per minute.
ppm means Parts per million
In 2003 carbon dioxide emissions were 370 ppm (parts per million). This year (2013) they reached 400 ppm. At the beginning of the Industrial Revolution they had been 280 ppm for thousands of years.
2 ppm means 2 parts per million.
ppm stands for "parts per million" and it is the amount of one substance in another substance. You would test for it using a test kit appropriate for whatever chemical level you are trying to determine, such as a chlorine test kit or a calcium hardness test kit.
Answering "How do you fix a 1995 Chevrolet Lumina emission test fail NO x ppm reading fail?"
PPM in diesel refers to "parts per million" and typically represents the concentration of sulfur compounds in the fuel. The lower the PPM value, the cleaner the diesel fuel and the environment. Regulations often set limits on the sulfur content in diesel fuel to reduce emissions and environmental impact.
PPM stands for "parts per million" and is a measure of concentration. In the context of diesel fuel, it often refers to the amount of sulfur present in the fuel. Lower PPM values indicate cleaner diesel with less sulfur content, which is important for reducing emissions and meeting environmental regulations.
I had the same problem with my 92 Prizm. NO ppm was 4350. I replaced the EGR Modulator and it solved the problem.