👉 Airfares can sometimes include hidden fees related to airport emissions and pollutants, often referred to as "fumes." These emissions come from aircraft engines and ground operations at airports, which release various pollutants such as nitrogen oxides, particulate matter, and carbon monoxide. While airlines typically don't list these specific environmental costs directly on ticket prices, some carriers are beginning to factor them into their pricing strategies or disclose them in sustainability reports. This can add an extra cost to flights, especially for those traveling during peak pollution times or to airports with higher emissions due to local industrial activity. Passengers might notice this as an additional charge or as part of a broader "carbon offset" program, reflecting the industry's growing awareness and efforts to address environmental impacts.