We have heard your feedback; the particulate matter sensor is one of the most requested items from our surveys. You can check it out at https://shop.apolloautomation.cloud/pages/product-interest. We've been working on the AIR-1 and would like to get your opinions: things we might have missed, things you dislike, different ideas, and things you love. We aim to create a sensor that meets the community's needs at a fair price. We believe this is the smallest (if you find one smaller, please provide a link), highest quality (PM is rated for 10 years; compare it to the ratings of most PM sensors for home automation), and cost-efficient sensor we could find. It can monitor cleaning chemical vapors, new paint fumes, gas stove emissions, 3D printer VOC/PM, pollen, dust, and much more. Please let us know what you think! We've submitted the first prototype for PCB printing, but we would like to hear your feedback so that we can make any necessary changes before releasing it to beta testers and then for sale.