Lowcost sensors offers two distinct benefits: affordable and yield results quickly and continually. Design of these sensors makes its ready for use with minimal setup and maintenance during its technical lifetime. The major drawback is the sensors are used as the auxiliary equipment, relying the laboratory equipment for calibration and comparison. In this post, the author will compare three sensors measuring fine particulate matters SDS011, PMS7003 and HPMA115S0. The sensors aimed to measure the ambient air quality. The results then compared with a reference station using Federal Equivalent Method (FEM) monitor. The goodness of fitting (R2) are ranging from 0.51 to 0.66 indicating a moderate confident using lowcost sensors in compared with a more accurate monitor. A fractional cost of these sensors introduce a unique benefit to build an air quality network.