Air pollution can have severe impacts on public health. A novel approach to lower the local particle concentrations at urban hotspots is ambient air filtration. This study presents experimental investigations into the effectiveness of air filters to lower ambient particle concentration levels at two different locations. Seventeen outdoor filtration devices with a total flow rate of 170.000 m³/h were installed beside federal highway B14 at Stuttgart “Am Neckartor” targeting to reduce PM₁₀ concentration levels within a 300 m × 50 m area around the urban pollution hotspot. Further measurements were conducted at the residential area “Bleyle quarter” to show the capabilities of a single filter device under relatively defined conditions. By periodically switching the filters on and off while monitoring the particle mass concentrations with optical particle counters, the effects of the filters on the PM₁₀ and PM_2.5 concentration levels were determined. A long term investigation at the Neckartor installation site (466 h) yielded an average PM₁₀ reduction of 10.4% (6.3 μg/m³) at the official Neckartor measurement station. Additional in situ measurement campaigns showed that the PM reduction effect decreases with increasing distance to the filter devices. However, the effect is clearly measurable in the walkway areas across the installation site.

空气污染会严重危害公共健康。降低城市热点地区局部颗粒浓度的一种新方法是环境空气过滤。这项研究提出了关于空气过滤器降低两个不同位置的环境颗粒物浓度水平有效性的实验研究。随着170.000立方米/小时的总流量十七户外过滤装置被安装联邦公路B14旁斯图加特“AM Neckartor”目标，以减少PM ₁₀城市污染热点周围300 m×50 m区域内的浓度水平。在居住区“ Bleyle街区”进行了进一步的测量，以显示单个过滤器设备在相对定义的条件下的功能。通过定期打开和关闭过滤器，同时使用光学颗粒计数器监控颗粒质量浓度，确定了过滤器对PM ₁₀和PM _2.5浓度水平的影响。在Neckartor安装现场进行的长期调查（466小时）得出的平均PM ₁₀Neckartor官方测量站可减少10.4％（6.3μg/m³）。其他现场测量活动表明，PM降低效果随着与过滤器设备距离的增加而降低。但是，在整个安装现场的走道区域中，效果显然是可以测量的。