The acceptable limit for carbon monoxide (CO) in a PUC certificate is below 0.3%.

 The acceptable limit for carbon monoxide (CO) in a PUC certificate is below 0.3%. 

Explanation

A PUC certificate is a pollution under control certificate that verifies that a vehicle meets emission standards. The acceptable limits for other parameters in a PUC certificate include: 

Hydrocarbons (HC): Below 200 parts per million (PPM)

Nitrogen oxides (NO): Below 800 PPM

The PUC certificate is important for a number of reasons, including:

Insurance: Insurance companies may require a valid PUC certificate to provide coverage. 

Car loans: Banks and financial institutions may ask for a valid PUC certificate when you apply for a car loan. 

Selling a car: A valid PUC certificate can make a car more appealing to potential buyers.