At that time, PM2.5 data was considered too politically sensitive and so the government was keeping it secret, but citizens were becoming aware of its harmful human health effects, and they were demanding greater transparency on the part of the government.
In quel momento, i dati PM2,5 venivano  considerati politicamente troppo delicati e così il governo li teneva segreti, ma i cittadini iniziavano a conoscere degli effetti nocivi sulla salute umana, e pretendevano una maggiore trasparenza da parte del governo.