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.
Na altura, os dados sobre o PM2,5 eram considerados politicamente sensíveis e, por isso, o governo mantinha-os em segredo, mas os cidadãos foram-se tornando cientes dos seus efeitos negativos na saúde, e exigiam mais transparência ao governo.