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We present multi-frequency scatter broadening evolution of 29 pulsarsobserved with the LOw Frequency ARray (LOFAR) and Long Wavelength Array (LWA).We conducted new observations using LOFAR Low Band Antennae (LBA) as well asutilized the archival data from LOFAR and LWA. This study has increased thetotal of all multi-frequency or wide-band scattering measurements up to adispersion measure (DM) of 150~pc\,cm$^{-3}$ by 60\%. The scatter broadeningtimescale ($\tau_{sc}$) measurements at different frequencies are oftencombined by scaling them to a common reference frequency of 1\,GHz. Using ourdata, we show that the $\tau_{sc}$--DM variations are best fitted for referencefrequencies close to 200--300\,MHz, and scaling to higher or lower frequenciesresults in significantly more scatter in data. We suggest that this effectmight indicate a frequency dependence of the scatter broadening scaling index($\alpha$). However, a selection bias due to our chosen observing frequenciescan not be ruled out with the current data set. Our data did not favour anyparticular model of the DM -- $\tau_{sc}$ relations, and we do not see astatistically significant break at the low DM range in this relation. Theturbulence spectral index ($\beta$) is found to be steeper than that isexpected from a Kolmogorov spectrum. This indicates that the local ISMturbulence may have a low wave-number cutoff or presence of large scaleinhomogeneities in the line of sight to some of the reported pulsars.

Multi-frequency scatter broadening evolution of pulsars - II. Scatter broadening of nearby pulsars