The results showed that the levels of chromium in house dust decreased to background levels after this period of time.
Parathion concentrations in house dust decreased 10-fold from 1992 to 1995, consistent with the discontinued use of this product in the region in the early 1990s.
In a previous study, we noted that ethyl parathion concentrations in house dust decreased dramatically after this compound was withdrawn from agricultural use (Fenske et al. 2002).
Finally mean concentrations of malathion residue in house dust decreased from year 1 to year 4 in both intervention and control communities; however, there were no significant differences between communities after adjusting for year, p = 0.43.
Healthy subjects had almost no response to inhaled dust, but HDM-allergic subjects showed varied responses: DEHPlow house dust increased eosinophil cationic protein, granulocyte-colony stimulating factor (granulocyte-colony stimulatingd IL-6, whereas DEHPhigh house dust decreased G-CSfactorIL-6.
By comparing Figs. 1, 4, and 5 (and Additional files 1, 2), we can see that the scale height of the dust layer decreases as the absolute value of the normalized pressure gradient force |f| decreases.
As a result, Eq. (6) is not satisfied, and the total dust mass decreases.
Because of the dominance of fshock, Eq. (6) is not satisfied, and the total dust mass decreases.
Besides, when the fuel is changed from Fujian anthracite to Shenhua bituminous coal and Indonesia lignite, SO2 emission and dust emission decreases, while the NOx emission increases.
Away from the ring plane, the dust density decreases exponentially (11 where σ = 1839 km is the full-width-half-maximum of the E ring at 4 RS and z = Z ∙ RS in km.
