A new report from MIT is linking aeroplanes to deaths... on the ground. The study suggests that aeroplanes flying at their normal altitude (10,000m) are emitting dangerous pollutants that contribute to 8000 deaths a year.
Currently, aircraft emissions are only regulated up to 900m. Why? Because it's been long assumed that anything emitted over 900m would be deposited into a part of the atmosphere that has significantly smoother air, which means in theory, that the air pollutants wouldn't be affected by turbulent wind that'd bring them back to the ground. One problem though: this might not be true.
To test the effect of aeroplane emissions, MIT used a computer model that combined flight data, a global atmospheric model and population density to see if the air pollutants would lead to an increased chance of death. They found that:
Analysis of these data revealed that aircraft pollution above North America and Europe - where air travel is heaviest - adversely impacts air quality in India and China. That is, even though the amount of fuel burned by aircraft over India and China accounts for only 10 percent of the estimated total amount of fuel burned by aircraft across the globe, the two countries incur nearly half - about 3,500 - of the annual deaths related to aircraft cruise emissions.
So how does North America and Europe, who are responsible for more flights, walk away with less deaths? Because in the testing, pollutants are emitted at an altitude where high-speed winds are flowing eastward, which mean flights in North America and Europe damage population-dense areas like India and China more.
For the moment though, it doesn't look like anything will change. Aeroplane companies believe they're a "small part of a big problem" and MIT probably still needs to do more research on the topic. I think if this data is even close to real, regulation at all altitudes is needed. [MIT via Fast Company]