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.
당시에, PM2.5 데이터는  정치적으로 너무 민감해서 정부에선 계속 감추기만 했습니다. 그런데 시민들은 미세먼지가  인체에 해롭다는 걸 알게 되었고 이를 투명하게 공개할 것을 정부에 요구하기 시작했죠.