Air Quality Index (AQI)
Air Quality Index (AQI) API by aqicn.org provides real-time air quality data for over 10,000 monitoring stations across 100+ countries, delivering AQI values, individual pollutant concentrations (PM2.5, PM10, ozone, nitrogen dioxide, sulphur dioxide, carbon monoxide), weather data, and health impact information in a unified API response. As urbanization and industrialization increase air pollution levels across Nigerian cities, the AQI API enables Nigerian health tech developers, environmental monitoring platforms, smart city initiatives, and public health organizations to build air quality awareness tools that help citizens make informed decisions about outdoor activities and exposure.
Air Quality Index values are returned on the standard 0-500 AQI scale with breakpoints corresponding to health risk categories: Good (0-50), Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), and Hazardous (301-500). The API also returns the dominant pollutant driving the current AQI reading and the station name and location for the data source. Nigerian environmental health apps can display color-coded AQI dashboards using these standardized categories, making air quality data immediately interpretable by everyday Nigerians without requiring scientific background.
PM2.5 (fine particulate matter 2.5 microns or smaller) is the pollutant of greatest health concern in Nigerian cities, associated with vehicle exhaust, industrial emissions, generator fumes, and Harmattan dust from the Sahara that blankets northern Nigeria between November and March. The AQI API returns PM2.5 concentration in micrograms per cubic meter alongside the derived AQI value, enabling Nigerian health apps to give specific warnings about fine particulate exposure during Harmattan season when PM2.5 levels spike significantly across the country.
Station coverage in Nigeria includes monitoring stations in Lagos, Abuja, and other major cities where air quality monitoring infrastructure has been deployed by environmental agencies and international organizations. The API aggregates data from diverse station networks, and for locations without nearby monitoring stations, it interpolates from surrounding data sources to provide coverage. Nigerian smart city platforms can use the available station data to seed their air quality dashboards and advocacy data with real measurements.
Historical air quality data is accessible through the API, allowing retrieval of past AQI readings and pollutant concentrations. Nigerian environmental researchers and public health analysts can use historical AQI data to correlate air pollution levels with respiratory disease rates, seasonal patterns (particularly Harmattan), and event-driven pollution spikes (such as industrial accidents or large-scale refuse burning). This historical analysis supports evidence-based environmental policy advocacy.
Health advisories based on AQI levels can be generated by Nigerian health apps using the standardized AQI category thresholds: recommending indoor activities when AQI exceeds 150, advising sensitive groups including children, elderly, and asthma patients to avoid outdoor exposure when AQI exceeds 100, and suggesting N95 mask use during Harmattan when PM2.5-driven AQI spikes. Digital health platforms serving Nigerian families can incorporate automatic AQI-based health alerts.
The AQI API offers a free tier with 1,000 requests per hour and API key access — sufficient for small to medium Nigerian environmental monitoring apps. Commercial plans provide higher limits, token-based access for multiple projects, and access to additional historical data depth. The combination of free access, global coverage, and health-contextualized data makes the AQI API an excellent choice for Nigerian environmental tech developers and public health organizations building air quality awareness platforms.