Calculation of maximum allowable increased PM2.5 emissions based on environmental benefit balance of emission increases and reductions in industrial parks and surrounding areas

LU Cheng-wei; LU Hui; YANG Xin-yue; SONG Dan-lin; ZHU Yi-ping; BAO Wen-yi; SHE Rui; ZHANG Zi-jian; HUANG Lan-yi; ZHAO Bin

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China Environmental Science ›› 2026, Vol. 46 ›› Issue (3) : 1256-1263.

Calculation of maximum allowable increased PM_2.5 emissions based on environmental benefit balance of emission increases and reductions in industrial parks and surrounding areas

LU Cheng-wei¹, LU Hui², YANG Xin-yue¹, SONG Dan-lin¹, ZHU Yi-ping², BAO Wen-yi², SHE Rui³, ZHANG Zi-jian⁴, HUANG Lan-yi⁵, ZHAO Bin¹

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Abstract

To investigate the correlation between emissions and environmental quality in industrial parks, thereby achieving refined management and control constrained by the environmental quality baseline, this paper proposes a comprehensive method for determining the maximum allowable emission increments in industrial parks based on the dynamic equilibrium of PM_2.5 concentration impacts. The approach balances emission reductions in surrounding buffer zones against increased emissions within the parks, creating development space through emission mitigation in peripheral areas. Case studies were conducted in industrial parks of Tianfu, Shuangliu, and Longquan district, Chengdu. Evaluations demonstrate that buffer zone emission reductions lowered PM_2.5 concentrations in park stations by 2.6, 1.7, and 2.1μg/m³, respectively. Based on current and target concentrations at park stations, the maximum allowable concentration increases were calculated as 1.9, 1.5, and 2.3μg/m³. Derived from simulated PM_2.5 concentrations and sequential emission increments, the composite response functions quantified the maximum allowable emission increases at 21.5, 73.7, and 200.1t, respectively. Emission reduction and increasing balance verifications showed that implementing these maximum increments resulted in concentration changes of -0.18, -0.44, and -2.50μg/m³ at control stations, confirming no deterioration of air quality. This methodology provides a novel approach for refined park management, enabling industrial development through peripheral emission reductions without compromising environmental quality, thereby creating sustainable growth space for industrial parks.

Key words

CMAQ / maximum allowable increased emissions / industrial park emission decreasing-increasing balance / PM_2.5

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LU Cheng-wei, LU Hui, YANG Xin-yue, SONG Dan-lin, ZHU Yi-ping, BAO Wen-yi, SHE Rui, ZHANG Zi-jian, HUANG Lan-yi, ZHAO Bin. Calculation of maximum allowable increased PM_2.5 emissions based on environmental benefit balance of emission increases and reductions in industrial parks and surrounding areas[J]. China Environmental Science. 2026, 46(3): 1256-1263

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