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.
Quais?" Naquela época, os dados de PM2.5 eram considerados politicamente muito delicados, então o governo os mantinha em segredo, mas os cidadãos começavam a ter noção de seus efeitos danosos na saúde humana, e pediam mais transparência por parte do governo.