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.
В то время данные о PM2.5 считались политически крайне деликатными и правительство не разглашало их, но граждане начинали осознавать их пагубность для здоровья и требовали большей прозрачности со стороны правительства.