english: 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.
non_english: V tom čase údaje o časticiach PM2,5 predstavovali delikátnu tému, a tak ich vláda uchovávala v tajnosti. Občania sa však dozvedali o ich škodlivom vplyve na zdravie a od vlády požadovali väčšiu transparentnosť.