The dust, although not toxic, irritates human respiratory apparatus, is harmful for vegetation it penetrates into people’ homes, etc. As regards meteorological effects, one mentions the following: it reduces the solar radiation’s intensity, it is an incentive factor for mist formation, it alters the thermal regime, and thus it can put its mark on the surface climate of a region. As regards local physical and geographical conditions, we mention that the monitored area has the advantage to be at lower altitudes, with a large opening towards west, which favours a free circulation of air masses which purify the air against the unpleasant effects of dust and industrial smoke.   In order to analyse the sedimentary powders in the Crisul Repede drainage area we employed the data provided by the branches of Cluj and Bihor counties of Environment Protection Agency. Both at Bihor County and at Cluj County level, monitoring activities on sedimentary powders are performed on a monthly sampling basis. Thus, the sedimentary powders are being sampled on a low flow regime in 14 sampling and checking points, divided in three areas at the level of Bihor County and one point at the level of Huedin city, with a monthly sampling, as following: 1 st area (county north-west area): Tarian, Biharia, Salard, Episcopia Bihor; 2 nd area: Baile 1 Mai (1 Mai Spa), Oradea meteorological station, Environment Protection Agency Oradea; 3 rd area: Telechiu, Chistag, Pestera, Alesd, Astileu, Subpiatra, Tetchea Huedin area. We have analysed the samples of powders at the level of three monitoring points in Bihor county deposited for a 15years’  time span, from 1994 to 2008 respectively, and for the Huedin area for a 5 years’ time span,  from,  2004 to 2008 respectively. The collected samples were covered all the months of the year. In order to carry out this research we have used a series of research methods, out of which we mention following: analysis method, deduction method, induction method, comparative method, mathematics-statistics method and graphs and interpolation method. The sanitary standard for sedimentary powders is of 17 g/m 2 /month and it was outrun only at Huedin sampling point. The high values recorded in this area are due to the fact that Huedin does not have a traffic belt highway for heavy traffic which is guided directly to  downtown where the monitoring point is located, as well as due to the Bologa and Poieni neighbourhoods.

powder; maximum rated value; monitoring points

Presentation: oral