Climate Change Cars are the world's single largest source of the greenhouse gases that are causing climate change. Air pollution and damage to human health Fumes from cars and other road vehicles contain many substances which cause air pollution and damage to human health. Ozone is harmful to human health, damaging the lungs and causing breathing problems such as asthma, coughing, sneezing, and chest pain. Ozone can also suppress the body's immune system. It is particularly dangerous to babies and people with heart disease.
Nitrous oxide causes irritation to the lungs, causing bronchitis and pneumonia.
Particulate matter is tiny particles that are suspended in the air that, when inhaled, can cause lung damage. This is because bigger particles are filtered out of the air when it is breathed in, but particulate matter is inhaled. It causes lung damage, breathing problems, and asthma. Volatile organic compounds are suspected to be the cause for carcinogenetic and mutagenetic effects. Using public transport is less environmentally damaging than using cars as it reduces the number of vehicles on the roads.