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снижение уровня загрязнения stresses
construct.	pollution abatement
environ.	pollution abatement (The reduction in degree or intensity of pollution in soil, rivers, lakes, seas, atmosphere, etc.; Снижение степени или интенсивности загрязнения почвы, рек, озер, морей, атмосферы и пр.)

снижение уровня загрязнения: 7 phrases in 3 subjects

Ecology	2
Environment	3
Technology	2