During this period, it was reported that the mining pollution was decreased in many presses, however, some researchers consider that it was because Yamada County had not been regarded as heavily polluted area in the beginning of the mining pollution and journalists did not visit there yet.
この時代、鉱毒が減ったような報道が多くされたのは、鉱毒発生当初は山田郡は鉱毒激甚地とはみなされていなかったため、マスコミが取材に訪れなかったためだと考える研究者がいる。