Air Pollution Hurts the Poorest the Most2019 UN article: "From Lagos and Lahore to London, it’s the poorest people who are most affected by air pollution. The poor tend to be priced out of the leafy suburbs where there are fewer highways and air quality is better.
Air pollution is caused by harmful particulates and gases released into the air. It leads to premature death from heart disease, stroke, and cancer, as well as acute lower respiratory infections. Indoor and outdoor (ambient) air pollution caused an estimated 7 million deaths globally in 2016, according to the World Health Organization."