1. Nitrogen Oxides (NOx): NOx is a collective term for nitric oxide (NO) and nitrogen dioxide (NO2). They are produced during the combustion process in diesel engines when nitrogen in the air reacts with oxygen at high temperatures. NOx emissions can contribute to smog and acid rain, and have adverse effects on human health, particularly respiratory problems.
2. Particulate Matter (PM): PM refers to small particles of solid or liquid matter emitted from diesel engines. These particles can vary in size and composition and are formed during incomplete combustion or when engine components wear out. Diesel engines emit a significant amount of PM, which can include black carbon, hydrocarbons, and inorganic compounds. PM poses health risks as it can be inhaled deeply into the lungs, leading to respiratory and cardiovascular issues.
In summary, diesel engines emit nitrogen oxides (NOx) and particulate matter (PM) as their primary pollutants. Reducing these emissions is crucial for protecting air quality and safeguarding human health.
