Correction to: Environ Monit Assess (2013) 185:6989–6999 https://doi.org/10.1007/s10661-013-3079-5

The original version of this article unfortunately contained a mistake.

The authors regret for the errors in a figure and recommend the following corrections:

The values on the Y scale of the original Figure 5 were 1000 times higher than the actual values. The corrected values are presented in the modified Figure 5.

figure a

In addition, one integrated CH4 value (T 05/11) of Figure 5 was found to be slightly underestimated. The corrected value has been incorporated in the modified Figure 5. Accordingly, the correlation and regression values have been modified to = 366.6*X-2817; = 0.55 in the modified Figure 5.

In the text, page No. 6996, line 17, the correlation coefficient is to be read as (= 0.55, = 15).

The authors would like to apologize to the readers for any inconvenience caused.