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"NOx" is used to refer to a group of nitrogen oxide (NO) and nitrogen dioxide (NO2) pollutants that are produced when fossil fuels are burned in a variety of processes including heating, transportation and industrial activities. NOx pollutes the air and has a negative impact on the environment and human health.

For the regulation of NOx emissions, NOx standards and classes were introduced, which set the maximum permitted emission values for various types of combustion equipment and vehicles. These standards aim to limit and reduce NOx emissions and improve air quality.

NOx classes are usually denoted by letters and numbers, where a higher number indicates a stricter standard. Here are some examples:

NOx Class 5: This class is common in older plants that have high NOx emissions. These devices can be less efficient and NOx emissions are at higher levels.

NOx class 3: This class represents a medium level of NOx emissions. Devices in this class must comply with stricter standards and NOx emission limits are lower than NOx class 5.

NOx class 2: This class indicates lower NOx emissions. Devices with this class must meet stricter standards and have lower NOx emissions than NOx class 3.

NOx class 1: This class is the strictest and means minimum NOx emissions. Devices in this class must meet very strict standards and their NOx emissions are minimal.

The aim of these NOx classes is to reduce NOx emissions in various industries and promote the use of cleaner and more efficient combustion technologies. Nowadays, new equipment and vehicles are usually designed and manufactured to meet stricter NOx standards and have lower emissions, which contributes to the protection of the environment and human health.

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