PM, CO2, temperature and humidity can be fairly accurately measured with consumer monitors provided they use good sensors. You can check if the monitor is RESE

PM, CO2, temperature and humidity can be fairly accurately measured with consumer monitors provided they use good sensors. You can check if the monitor is RESET AIR certified which is an independent and 3rd party test against reference devices. https://www.reset.build/directory/monitors/air https://www.reset.build/directory/monitors/air