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A study of Northern California residents last year found carbon monoxide and nitrogen dioxide exposure, largely the product of vehicle emissions, was correlated with risk of tuberculosis.

In addition to smoke and soot, the space agency detected large plumes of harmful gases emanating from the wildfires, including lung-irritating nitrogen dioxide and cancer-causing formaldehyde.

In 2016, before it started, London had the highest concentration of nitrogen dioxide - a key air pollutant from road traffic - of any city in the UK.

Researchers concluded exposure to nitrogen dioxide emissions alone may contribute to nearly 19,000 premature deaths in the United States each year.

For decades, scientists have known the flames from a gas stovetop produce nitrogen dioxide, a pungent gas that can inflame a person’s lungs when inhaled.