Frequently Asked Questions

FAQ Basics

Created by the United States Environmental Protection Agency, the Air Quality Index measures the amount of pollutants in the air and its impact on our health. The AQI is based on five criteria pollutants: ground-level ozone, particulate matter, carbon monoxide, sulfur dioxide and nitrogen dioxide. The AQI that we calculate is for particulate matter or PM2.5.

PM2.5 is atmospheric particulate matter with the diameter of 2.5 micrograms or less -- 3% the diameter of human hair. Their small size makes it able to bypass the nose and throat to the lungs and circulatory system, which can lead to adverse health effects such as asthma, lung cancer, heart disease and stroke. The most common manmade sources for PM2.5 is burning gasoline oil, diesel fuel, power plants, motor vehicles, factories and burning. 

We use the PM2.5 measurements and convert them to AQI values. While there are many different pollutants, PM2.5 is widely regarded as one of the most deadly to human health due to its small size and ability to penetrate through the lungs and circulatory system.

Our sensors are located in all 5 districts of Jakarta, Tangerang, Tangerang Selatan, Bekasi, Depok and Bogor.

We are using an Airly Particulate Matter Sensor that measures temperature, humidity, pressure, PM1, PM2.5 and PM10 every five minutes. The sensor is certified by the European Union as well as the Indonesian Ministry of Communication and Information Technology (Kominfo). These sensors are specially made to be weather-proof and durable outdoors.

The measurements can generally be applied to a 500 meter radius. The PM2.5 readings accuracy for 0-100 mg/m3 (0-174 AQI) is ±10mg/m3 and for 101-500 mg/m3 (175-500 AQI) is ±10%

We have strategically installed sensors across the Greater Jakarta Area. The sensors are installed outdoors at 1.5 to 8 meters above ground. The installation has either been done or assisted by our team to ensure proper installation.

The PM2.5 data and AQI equivalent is updated in the app every 20 minutes.

The AQI levels in the nearest proximity to you should be a good indicator of the real-time air quality. This information could be beneficial in taking the necessary precautions when the air quality is poor (e.g. reduce heavy exercise outdoors, turning on the air purifier, etc). With real-time air quality data, you can schedule your outdoor activities accordingly and reduce your exposure to air pollution, among others. Check out our different recommendations for different AQI levels!

Ground-based sensors give out the most accurate and reliable air data. Nafas currently has 5X as many ground-based sensors as the nearest competitor, and is growing. Our sensors are also designed to be outdoors. Our sensor network is standardised, making for effective troubleshooting shall any problem were to occur. Nafas is also made in Indonesia, with the purpose of better equipping residents of the Greater Jakarta Area with the data and information to reduce their air pollution exposure.

Government stations use gravimetric measurements, whereas we use laser sensors. While the gravimetric measurements are more accurate and measure more pollutants, their extremely high cost doesn’t allow for extensive coverage. We also calibrate our sensors to stations managed by the US Embassy to provide the most accurate data.

Nafas has built an exclusive partnership with Airly, an air quality sensor company established in the European Union providing high-quality air quality monitors and advanced AI-driven data management. The company's products are used worldwide, including in the USA, France, Germany, United Kingdom, Netherlands, Belgium, Poland, Romania, UAE and many others.

The Airly PM2.5 sensor is a device that was built exclusively for outdoor usage. It can withstand temperatures from -30oC to +40oC, and is water resistant to protect from rain. There are over 4000 Airly sensors installed globally.

In 2019, the Airlab Airparif test in Paris, France highlighted the Airly PM2.5 sensor as the best performing in its category. The sensor has also been tested by universities in the European Union.

Yes, we are constantly looking to expand our network. If you would like to host a sensor or purchase one, click here.