What health issue is most closely linked to air pollution caused by vehicles?

Air pollution caused by vehicles is primarily linked to respiratory problems, including asthma, due to the emission of harmful pollutants such as nitrogen oxides, particulate matter, and volatile organic compounds. These pollutants can irritate the airways and lungs, leading to increased respiratory issues and the exacerbation of conditions like asthma. The fine particulate matter, in particular, can penetrate deep into the lungs and even enter the bloodstream, causing inflammation and worsening respiratory health.

While heart conditions and neurological disorders can also be influenced by air pollution, the direct and immediate impact of vehicle emissions is most significantly observed in respiratory health. These pollutants are known to trigger asthma attacks and contribute to other chronic respiratory illnesses, making respiratory problems the most closely associated health issue with vehicle-related air pollution.