ABSTRACT In an urban commune of Santiago, Chile, a monitoring campaign for dew and PM10 atmospheric particulate matter was implemen- ted during 2022. The pH, conductivity, cation and anion concentrations of dew water, and the water-soluble fraction of PM10, were analyzed. In the water-soluble fraction of PM10, the average cation concentrations were: 4.19 μgm3 for ammonia; 1.40 μgm-3 for calcium; 0.46 μgm-3 for potassium; 0.36 μgm-3 for sodium; and 0.17 μgm-3 for magnesium. In a decreasing order, concentrations were: NH4 > Ca > K > Na > Mg > Zn > Ba > Cu > Mn > Al > As > V. Among anions, the nitrate ion showed concentrations within the 4.49 to 20.09 μgm-3 range. The concentration of the carbonate ion ranged between 0 and 6.7 μgm-3; the sulphate ion ranged from 2.65 to 6.13 μgm-3; the chloride ion from 2.21 to 3.43 μgm-3 M; the phosphate ion varied between 2.08 and 2.33 μgm-3; the nitrite ion between 1.21 and 1.33 μgm-3; and the f luoride ion between 0.14 and 0.18. Simultaneously, 60 water dew events were collected during working days, with a total volume of 6465 mL, and 20 events on weekends. This volume was similar to the total level of rainfall in Santiago during 2022 (8217mL). In the dew water, the mean pH was 7.47, and the mean concentrations were: ammonia:13300 μgL-1, calcium: 12040 μgL-1, potassium: 2600 μgL-1, sodium 1530 μgL-1, magnesium: 669 μgL-1, zinc: 65 μgL-1, manganese: 50 μgL-1, and copper:19 μgL-1. Among anions, mean concentration values were: chlorides: 8720 μgL-1; sulphates: 28938 μgL-1; nitrates: 32538 μgL-1: nitrites: 7556 μgL-1; and carbonates: 14540 μgL-1. Simple linear correlations between cations and anions present in dew water and PM10 showed values of 0.788 and 0.81, indicating a key removing role from the dew water in this city. In Santiago, dew water has a cleansing or removal effect as important as that of rain water.