The kit includes the following indicators for on-site assessment of ambient air quality: sulfur dioxide (SO2), nitrogen dioxide (NO2), volatile organic compounds (benzene, toluene, ethylbenzene, w / w xylene, oxylene (BTEX)), carbon monoxide (CO) , particulate matter (PM10). Number of research points: 37 The purpose of ambient air monitoring is to assess the level of ambient air pollution and the reasons for changes, to provide the public with information related to ambient air quality. Surveys are conducted every two years.