Is the sour taste of COFCO monosodium glutamate factory in Longjiang County harmful to human body?

I'm not sure, it may be just the acidic smell of yeast fermentation, but it may also contain H2S (hydrogen sulfide). If mixed with the latter acid gas, it is harmful to human body. But as far as domestic production is concerned, nine times out of ten, waste water and waste gas are discharged illegally, because supervision is not in place. If you really don't feel at ease, you can also take a regular gas detector back for testing. As long as the test results are reliable, there is a basis for you to complain to the local authorities. If you are worried about gas detection, you can consult Zhuhai Foster and give you professional advice.