The simple answer to the question of who is affected by air pollution is, well, just about everyone. Pollution levels are significantly higher in urban areas, but that doesn't mean rural-dwellers are exempt. In fact, agricultural waste - pollutants from fertilizers and machinery emissions, for example - in rural areas has caused a rise in the amount of pollution in areas with low-population (Robertson). Generally speaking, individuals with heart disease and lung disease are at higher risk for health problems caused pollution. Additionally, pregnant women, those who work outdoors, children and athletes have a higher risk for contracting pollution-related health problems (Air Quality).
You can check the Air Quality Index (AIQ) in your city, or the city to which you're traveling, here at AirNow.gov. If you are sensitive to air pollution, or your area is in or below the "moderate" level, you may want to consider breathing Oxygen Plus pure recreational oxygen to help diminish your exposure to polluted air.
Pollution can cause a range of serious short- and long-term health effects. Those who live in regions with high levels of pollution may notice symptoms such as wheezing, chest pain, dry throat, headache or nausea as well as reduced resistance to infection and increased fatigue. These symptoms occur because the respiratory system must work extra-hard to supply the body with essential oxygen (Air Quality). Here are some of the long-term health effects associated with pollution:
"Air Quality Information for the Sacramento Region." Spare The Air: Health Effects of Air Pollution. N.p., n.d. Web. 15 Feb. 2017.
"Particulate Matter (PM) Pollution." EPA. Environmental Protection Agency, 18 Jan. 2017. Web. 10 Mar. 2017.
Robertson, Hannah. "Air Pollution; Rural vs Urban Cities." Prezi.com. N.p., 24 Jan. 2014. Web. 15 Feb. 2017.