For Feature A01: Air Quality, the WELL standard sets thresholds for indoor air quality that are typically lower than the outdoor air quality levels to ensure that the indoor environment provides a safe and healthy atmosphere for occupants. If the outdoor annual average for PM2.5 is 30 µg/m³, indoor levels need to be significantly lower to meet WELL requirements, which are usually aligned with recognized health-based standards. Therefore, the option with the lowest levels of PM2.5 and PM10 would be the one that meets the requirements, as it indicates better filtration and air quality control measures are in place.