As important green infrastructure, greenspaces in high-density central urban districts serve as an important outdoor space for the surrounding residents, especially the elderly. Meanwhile, the ambient air pollution via particulate matter in such areas is closely related to the physical and mental health of the elderly visitors who suffer long-term exposure. This study is initiated to build a technological path between haze exposure and the elderly based on the positive and negative relationship between greenspace exposure and haze exposure under the background of the national strategy of healthy aging. In addition, the structured questionnaire interviews and the measured evidence-based experiments were conducted to collect data including physical environment data, crowd activity data, haze cognition data and basic population information. Combined with various statistical analyses including correlation analysis and mediating factor analysis, the impacts of haze in urban greenspaces on the decisions of the elderly to go out to visit such spaces as well as their physical and mental health were explored. A total of 138 crowd activity data and climate data were recorded, and 200 valid questionnaires were obtained. The results showed that the physical exercise and the social contact were two main reasons for the elderly to the greenspaces, and the typical activities of the elderly varied with the difference of physical environment using correlation and mediating effect analysis. Moreover, the air quality of six research sites reached or even be above moderate pollution (PM_2.5≥115μg/m³) during more than 70% of the survey period, suggesting that the air quality was worrying and exposed elderly visitors to serious health risks. According to questionnaire, the cognitive limitations on the potential hazards of haze were commonly existed in the elderly due to insufficient understanding of haze, vague perception and psychological neglect. In addition, the multiple and complex internal driving forces led to the decision-making of the elderly people to go to the greenspaces more perceptual than rational. Overall, there is no prominent correlation between PM_2.5 concentration and crowd activities, showing that haze has little impact on the travel decision of the elderly since their insensitivity to haze pollution. There exists a gap between the cognitive decision of the elderly and the actual potential health hazards of haze. The results highlight the urgency of measures to promote healthy aging, and the importance of actively promoting the optimization of elderly-oriented landscape, which has certain reference value for the current human settlement environment construction.