Given the problem of considerable livestock and poultry pollution and the differentiation of the regional agricultural layout in China, the combination of planting and breeding (CPB) forms an agricultural co-agglomeration to recycle manure waste into croplands to reduce livestock and poultry pollution. This study aims to evaluate CPB co-agglomeration and empirically examine its effects on livestock and poultry pollution. Based on provincial data from 1997 to 2020 in China, this study constructed three indicators to evaluate CPB co-agglomeration, summarized its temporal and spatial characteristics, and conducted a spatial analysis using the Spatial Lag Model (SLM) to empirically investigate its effect on livestock and poultry pollution. The results showed that: first, from 1997 to 2020, the overall level of CPB co-agglomeration in China declined and the region with higher CPB co-agglomeration level transferred from the central provinces to the west provinces. Second, livestock and poultry pollution in most provinces had significantly positive spatial correlations with adjacent regions. The co-agglomeration of CPB had a significantly positive effect on reducing livestock and poultry pollution; however, the effect had no significant spatial spillover. Third, the breeding industry agglomeration and the moderate expansion of breeding industry scale significantly reduced pollution. These findings provide a reference for reducing livestock and poultry pollution by promoting CPB co-agglomeration to establish a waste recycling system. Optimizing the layout of the planting and breeding industry helps achieve the goal of long-term sustainable development of the breeding industry.

Objective This paper evaluates the effect of National Basic Public Health Services (NBPHS) on the health of internal migrants in China. Study design: The study design used in this research is a cross-sectional study. Methods Data were obtained from the China Migrants Dynamic Survey (CMDS) of 2017, including 150,384 internal migrants at the age of 15–59. Propensity score matching (PSM) was used to estimate the effect of NBPHS. Results The findings indicate that NBPHS is successful in improving the health of internal migrants. Different matching algorithms showed the improvement ranging from 2.7 to 2.9 percentage points for the indicator of self-reported health, compared with the reduction of the probability of having disease ranging from 3.3 to 3.7 percentage points in the past year. However, gains are not shared equally. Heterogeneity analysis found significant improvement in the health of patients with hypertension, but the health improvement of diabetics was relatively small. There was also no significant effect on patients with both hypertension and diabetes. Similarly, less improvement was observed in those over 65 years old. Conclusions This research suggests that policymakers should not only pay attention to the equalization of project implementation but also focus on narrowing the benefits gap between different groups of internal migrants. This finding highlights the importance of encouraging more young doctors to provide health services in primary institutions and promoting the sinking of high-quality medical resources.