The indoor air quality (IAQ) of five low-energy London apartments has been assessed through the measurement of 16 key pollutants, using continuous and diffusive methods across heating and non-heating seasons. This case study approach aimed to assess the presence of pollutants within low-energy apartments and to better understand the role of ventilation and seasonal variations in indoor air quality. The results indicate strong seasonal variations, driven by increased natural ventilation rates over the summer monitoring period. A combined metric for indoor and outdoor pollutants (I_tot) suggests that the IAQ in the winter (I_tot = 17.7) is more than twice as bad as that seen in the summer (I_tot = 8.6). Formaldehyde concentrations were lower in the non-heating season, indicating increased ventilation rates more than offset increased off-gassing, in contrast to findings in other studies. However, increased summertime ventilation rates were observed to increase the proportion of outdoor pollutants entering the internal environment. This resulted in higher indoor concentrations of NO₂ in the summer than the winter, despite significant reductions in outdoor concentrations. These results demonstrate the impact of ventilation practices upon IAQ, the influence of occupant actions and the complex relationship ventilation rates play in balancing indoor and outdoor sources of air pollution.

伦敦五个低能耗公寓的室内空气质量（IAQ）已通过在供暖和非供暖季节使用连续和扩散方法对16种主要污染物进行了评估。该案例研究方法旨在评估低能耗公寓中污染物的存在，并更好地了解通风和室内空气质量季节性变化的作用。结果表明，强烈的季节变化是由于夏季监测期内自然通风率增加所致。对室内和室外污染物的综合指标（I _tot）表明，冬季的室内空气质量（I _tot  = 17.7）比夏季的IAQ高出两倍（I _tot） = 8.6）。与其他研究结果相反，在非供暖季节，甲醛浓度较低，这表明通风速率的增加大于抵消排气量的增加。然而，观察到夏季通风速率的增加会增加进入内部环境的室外污染物的比例。尽管室外浓度显着降低，但夏季的室内NO ₂浓度仍高于冬季。这些结果证明了通风习惯对室内空气质量的影响，乘员行为的影响以及通风速率在平衡室内和室外空气污染源方面的复杂关系。