Global Ambient Air Quality Monitoring Market By Type (By Product (Portable Monitoring System/Stationary Monitoring System) , and By Pollutants Type (Primary Pollutants/Secondary Pollutants)), By Application (Oil And Gas , Power Generation Plants , Food & Beverages , and Pharmaceutical), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029