"The study found that commuters who turn on the recirculation are exposed to around 80 percent less harmful particles than those who open their car windows."
Doesn't that mean they have 5 times more exposure, not 80% more?
It depends on how they calculated percent change, but looking at the journal article, you are correct. From the abstract...
> Compared with recirculation, PM2.5 and PM10 were higher by up to 589% (Blantyre) and 1020% (São Paulo), during windows-open and higher by up to 385% (São Paulo) and 390% (São Paulo) during fan-on, respectively.
The headline should read 400% more to reflect the 80% reduction. This is a massive failure of the university press office and I think your comment should be at the top.
> Compared with recirculation, PM2.5 and PM10 were higher by up to 589% (Blantyre) and 1020% (São Paulo), during windows-open and higher by up to 385% (São Paulo) and 390% (São Paulo) during fan-on, respectively.
The headline should read 400% more to reflect the 80% reduction. This is a massive failure of the university press office and I think your comment should be at the top.