Activists are warning against air pollution in Indonesian cities which they said had reached alarming levels.

Based on daily monitoring, urban residents inhaled healthy air less than two months per year due in large part to poor transportation management.

A group of activists and government officials from the State Ministry for the Environment and the Transportation Ministry established a Forum for Indonesian Clean Air as part of its mission to push for sustainable transportation management to minimize air pollution.

“The air quality has frequently been dangerously unhealthy. The country needs extra efforts to clean the air through sustainable transport management,” Ahmad Safruddin, who initiated the forum, told reporters Tuesday.

Ahmad, who is also the chairman of the Indonesian Lead Information Center (KPPB), said that poor quality of fuels, gas emission...