Emission Norms - India

EMISSION NORMS:

BS II vs BS III 

Euro III Vs BS III 

COMPOSITION OF EXHAUST:

• Nox – Nitrous Oxides They are formed by a reaction between the Nitrogen and Oxygen in the air at high temperatures. 
• HC – Hydrocarbons They are elements of unburned fuel which have formed as a result of a low combustion temperature and/or a poor air-fuel mixture. They give diesel exhaust its characteristic smell. 
• CO – Carbon mono oxides They are formed at the intermediate combustion stage as a result of air deficiency, which results in incomplete oxidation from CO to CO2 
• PM – Particulate Matter They consists of a core of carbon (<10μm) and comes from the fuel & oil. It is primarily the result of poor A/F mixture (also excessive EGR).  
• SO2 – Sulphur dioxide They are formed due to reaction between Sulphur present in fuel and oxygen in air.