Global Exhaust Gas Cleaning System(EGCS) Market By Product Type (Open Loop Exhaust Gas Purification System, Closed Loop Exhaust Gas Purification System, Mixed Waste Gas Purification System) And By End-Users/Application (Oil & Gas, Steel Processing, Pharmaceuticals, Fertilizer Manufacturing, Textile Processing, Others) Global Market Share, Forecast Data, In-Depth Analysis, And Detailed Overview, and Forecast, 2021 - 2028