Air pollution can cause interference with the respiratory tract, one of which is allergic colds or allergic rhinitis. Air pollution is not only found outdoors, but can also be indoors. For example, in a factory, office, or even at home. Substances that are pollutants (causing pollution) in the air are carbon monoxide (CO), carbon dioxide (CO2), nitrogen dioxide (NO2), sulfur dioxide (SO2), formaldehyde, phthalate, and polluting particles (PM). These various types of substances can trigger allergic colds in some people. Indoors, air pollution comes from toxic gases, volatile organic compounds (VOCs), mites, pet dander, fungi, bacteria, and viruses. These pollutants are generally produced from emissions of vehicles, building materials, household furniture, air freshener, cooking, smoking, or when someone coughs and sneezes in the room. According to research abroad, the cause of air pollution can reach 5 times more when indoors than outdoors. This happens due to lack of ventilation t...