Global Gas Chemical Sensor Market Size, Trends, By Gas Type (Oxygen/Lambda Sensor, Carbon Monoxide, Ammonia, Chlorine, Hydrogen Sulphide, Nitrogen Oxides, Methane, and Others), By Technology (Electrochemical, Semiconductor, Thermal conductivity, Photo Ionization Detectors, Metal Oxide Semiconductor, Catalytic, and Others), By End-User (Water & Wastewater Treatment, Building Automation, Domestic Appliances, Environmental, Defense & Military, Petrochemical, Industrial, and Others), By Region (North America, Latin America, Europe, Asia Pacific, and Middle East & Africa): Growth Opportunity Analys