Nitrogen oxides (NOx) are a group of gases that are produced by the combustion of fuels, such as gasoline, diesel, and natural gas. They are also produced by industrial processes, such as the production of cement and fertilizers. NOx gases are harmful to human health and the environment. They can cause respiratory problems, such as asthma and bronchitis, and they can contribute to the formation of smog and acid rain.
There are a number of ways to avoid nitrogen oxides. One way is to reduce the amount of fuel that is burned. This can be done by driving less, using public transportation, or walking or biking instead of driving. Another way to avoid nitrogen oxides is to use cleaner fuels, such as natural gas or electricity. Finally, nitrogen oxides can be removed from the exhaust of vehicles and industrial processes using catalytic converters and other pollution control devices.