Reducing the environmental pollution is one of the major challenges before the world today. A significantly higher amount of pollution is caused by high usage of transportation means such as cars, buses, and trucks. As these vehicles run by burning fossil fuels, they emit nitrogen oxide and carbon monoxide, which are gases causing a significant amount of air pollution. This increases health-related and environmental concerns.

Automotive emission sensors help in determining the level of emissions from vehicles in order to take measures to reduce the emission of harmful gases. Emissions given out depend on various factors such as fuel quality, air–fuel ratio, and performance of the engine and its components. Automotive sensors not only detect the harmful gas emissions, but also indirectly help in determining the engine performance. Automotive sensors are used in different types of automobiles from passenger cars to heavy-duty trucks. There exist primarily two types of gas emission sensors viz. O2 sensors and NO2 sensors.

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O2 sensor is a device used for determining the oxygen content of gases emitted from the exhaust pipe of a vehicle. The quantity of oxygen in the exhaust gas is a very good indicator of combustion efficiency; hence, the exhaust pipe of a vehicle is the best place to install O2 sensors to monitor the air–fuel ratio. NO2 sensor is classically a high-temperature device built to detect nitrogen oxide in the combustion environment such as a tailpipe or exhaust pipe of an automobile and truck.

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Drivers for the global automotive sensors market can be associated with the implementation of strict and tough emission norms across the world. As automobiles is a part of daily routine, they need to perform well and cause less emissions to reduce the air pollution. The increased use of automobiles is one of the major factor driving the automotive sensors market.

Automotive sensors are used not only for control purpose but also for diagnostics. In order to meet the emission standards, modern automobile engines need to control a wide range of parameters and for this, a wide range of sensors are required. At the same time, exhaust emission level must be maintained over the useful life of vehicles. In order to meet all these objectives, extensive research and development is being conducted to develop technologically advanced emission sensors, which would meet the customer demand and comply with the emission standards of OEMs.