The Criteria Air Pollutants Levels During Calm Atmospheric Conditions: A Case Study

Air pollutants may cause changes in atmospheric composition and chemistry, which results in global warming, ozone depletion, dry and wet deposition, and unwanted effects to human, animal, plant and material. Emissions from mobile sources have been one of the major sources of air pollution in some big cities. Stationary emission sources generally have an important contribution to the air pollution. Over the past several decades, the development of inefficient heavy industry and power stations, fuelled by poor-quality lignite has created major pollution episodes.Criteria air pollutants including CO (carbon monoxide), NOx (NO +NO2) (nitrogen oxides), O3(ozone), SO2 (sulphur dioxide) and PM (particulate matter) are generally accepted as the quality parameters of ambient air. The high pollution levels is monitored in urban situated mountainous areas during calm conditions (stable thermal inversion and wind velocity