Tolerable limit of nitrogen oxides in air is __________ ppm.a)0.1b)1c)...
The tolerable limit of nitrogen oxides in air is 5 ppm.
Explanation:
Nitrogen oxides (NOx) are a group of highly reactive gases that include nitric oxide (NO) and nitrogen dioxide (NO2). They are formed during combustion processes, such as those that occur in power plants, industrial boilers, and automobiles. Exposure to high levels of NOx can cause respiratory problems, including coughing, wheezing, and shortness of breath. Long-term exposure can lead to chronic lung diseases and cardiovascular problems.
To ensure public health and safety, regulatory agencies have established air quality standards for NOx. The tolerable limit of NOx in air is set at 5 ppm (parts per million) by the National Ambient Air Quality Standards (NAAQS) in the United States. This means that the concentration of NOx in the air should not exceed 5 ppm over a specified time period, typically one hour or one year.
Other countries and organizations may have slightly different limits for NOx, depending on their specific air quality concerns and regulatory frameworks. However, in general, the tolerable limit of NOx in air is considered to be around 5 ppm.