Poor levels of air quality could be causing asthma sufferers more problems when attempting to control their condition.
Recent research conducted in France has suggested that high quantities of ozone (O3) and particulate matter (PM10) can cause asthma to become uncontrollable.
The study - which has been published in the Journal of Epidemiology and Community Health - noted that the risk of uncontrolled asthma was 69 per cent greater when a person was exposed to O3.
It also suggested that people who came into regular contact with PM10 had a 35 per cent greater chance that their condition could become more aggressive.
"Our results indicate that both ambient O3 and PM10 concentrations jeopardise asthma control in adults. Our results are robust," the report read.
Recent air monitoring statistics published by the Independent showed that while air quality in London was reported as "good" at the start of May, Paris could only muster a "moderate" reading, suggesting the French capital suffers from high pollution levels.
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