ការព្យាករណ៍គុណភាពខ្យល់

ចំណាំថាការវាស់វែង PM 2.5 (ភាគល្អិតល្អ) ត្រូវបានយកចេញពីស្ថានីយ៍៖ 7th Ave, Marysville, Washington and the measurement for O3 (ozone) are taken from the station: S Second St, Mt Vernon, Washington and the measurement for CO (carbon monoxide) are taken from the station: Town Center, Lake Forest Park, Washington







