Researchers have shown how controls on air pollution can lead to fewer deaths from lung diseases.
The study, published in the International Journal of COPD, centred on North Carolina in the US where, in the early 1990s, several national and state-level air pollution limits were put in place.
Focusing on the period between 1993 and 2010, the researchers looked at death records and air quality data from the state.
They found that death rates from emphysema, asthma and pneumonia decreased in the state in line with the air quality controls, which clamped down on a range of different emissions considered to be major public health concerns.
Learn about the factors that can cause lung disease and the ways to reduce your contact with them.
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