Soms J, Soms H. APPLICATION OF LOW-COST OPTICAL PM SENSOR FOR MONITORING OF PARTICULATE MATTER AIR POLLUTION IN THE URBAN ENVIRONMENT: A CASE STUDY IN ESPLANĀDE HOUSING ESTATE, DAUGAVPILS CITY. ETR [Internet]. 2021 Jun. 16 [cited 2024 Nov. 23];1:223-9. Available from: https://journals.ru.lv/index.php/ETR/article/view/6595