This Act is formulated to improve indoor air quality and to protect public health.

"Competent authority" as referred to in this Act means the Environmental Protection Administration, Executive Yuan, at the central government level, the municipal government in special municipalities and the county or city government in counties or cities.

The terms used in this Act are defined as follows.
I."Indoor" means closed or semi-closed space in buildings intended for public use, and passenger carrying space by means of mass transportation.
II.Indoor air pollutant: refers to substances that are normally dispersed in indoor air, and which may directly or indirectly affect public health or the living environment after longterm exposure, including carbon dioxide, carbon monoxide, formaldehyde, total volatile organic compounds, bacteria, fungi, airborne particles with a particle diameter of 10 micrometers or less (PM10), airborne particles with a diameter of 2.5 micrometers or less (PM2.5), ozone, and other substances designated and officially announced by the central competent authority.
III. "Indoor air quality" means the concentration of indoor air pollutants, air humidity, and temperature.

The central competent authority shall perform all tasks related to overall planning and the promotion of indoor air quality management, and shall determine and revise indoor air quality management laws and regulations and indoor air quality standards as well as analysis or monitoring methods.
The powers and responsibilities of industry competent authorities at all levels are distributed as follows:
I.Construction competent authorities: Matters relating to building ventilation facilities, building interior finishing management, and building interior finishing materials management.
II.Economic affairs competent authorities: Matters relating to national standards for fugitive air pollutant emissions from interior finishing materials and products, and national standards for air purifiers.
III.Public health competent authorities: Matters relating to the prevention and management of infectious pathogens, air conditioning standards for medical institutions, and tobacco hazard prevention.
IV. Transportation competent authorities: Matters relating to the ventilation rate of air conditioning equipment in means of mass transportation, and ventilation facility maintenance and management.
Industry competent authorities at all levels shall guide premises under their authority to improve their indoor air quality.

Competent authorities and industry competent authorities at all levels may commission professional organizations to conduct matters relating to surveys, tests, education, public awareness, guidance, training, and research related to indoor air quality.