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  Introduction Air pollution is a major threat to our health. The air we breathe is the most important source of sustaining life on earth. Breathing clean air is essential for good health. Air pollutants are categorized as either primary or secondary. Exposures to hazardous chemicals in the air can cause cancer, as well as damage to the brain, nerves, liver, or kidneys Air pollution is rising at an alarming rate and is a major threat to our health. Air pollution is rising at an alarming rate and is a major threat to our health. It's a serious problem worldwide, but the impact of air pollution on public health has been largely overlooked in developing countries. In fact, there are few studies that have looked at how air quality affects human health in low-income countries. Air pollution can cause serious illnesses such as lung cancer, heart disease and strokes—and these diseases are often seen as preventable through simple measures like wearing masks or washing hands after using pub

  WELDER QUALIFICATON PROCEDURE (FOR PLATE &PIPING) 1.      Test positions for performance qualification 1.1   Positions (Groove weld) plate & pipe: - An angular deviation of plus or minus 15° From specified horizontal and vertical planes is permitted during welding. Position for qualification as per ASME IX QW-461.3 & QW-461.4 Table. 1 Plate Positions Pipe Positions a)        Vertical Position 3G (Fig.1a) b)        Overhead Positions 6G- (Fig.1b)   b) Overhead Position 4G (Fig.1a)               Fig. 1 Position of test peace for Groove weld (Plate & Pipe). 1.2   Test Positions for Fillet Welds: - An angular deviation of plus or minus 15° from the specified horizontal and vertical planes is permitted during welding. Position for qualification as per ASME QW-461.5 Table.2 Fillet joint Positions         a)   Vertical 3F        b)