Fighting air inequality through open data and community.

OpenAQ is the largest open-source air quality data platform, aggregating and harmonizing historical and real-time air quality data from diverse sources from across the globe.

#### Sources
OpenAQ is an aggregator of many sources of air quality data. The platform maintains a reference to the original source of the data we collect. Some sources may provide an additional readme text file with additional metadata about the source.

#### Implementation
OpenAQ aggregates air quality data from disparate sources around the world to provide access of these sources in a single location. OpenAQ uses an ETL (Extract-Transform-Load) process to ingest and harmonize air quality data. The data process has four main components: fetch, storage, presentation and archive.

#### API Core Concepts
**Fetch**: OpenAQ fetch scripts range from HTML scrapers, FTP directory scanners to REST API scrapers depending on the source of the data.
**Storage**: Data is stored in a PostgreSQL database using the TimeScale extension for added time series functionality and PostGIS for geospatial functionality.
**Presentation**: OpenAQ provides a REST API for programmatic access of the database.
**Archive**: Data is stored in a publicly available AWS S3 bucket via the Open Data on AWS program.

openaq API

The most trusted historical, real-time and forecast air quality data.

### Accurate local air quality and weather data

 #### Largest network of air sensors
AirVisual collects data from the largest network of ground-based sensors worldwide, providing the most accurate and reliable air quality information.

#### AI-driven data validation
The only air quality data you can rely on. All data points are validated using artificial intelligence and machine learning, to ensure data your users can trust.

#### Premier customer support
Our dedicated API support team is on hand to help you quickly and seamlessly integrate air quality data to your applications.

#### Information you can access includes:
**Location Information:** City name, station name and coordinates, GPS coordinates
**Air Quality Information & Pollutants:** AQI Index, PM2.5 and PM10, SO2, CO, O3, NO2
**Weather:** Humidity & pressure, wind speed & direction, 3-day forecast

Air quality API

Build climate intelligent solutions powered by smart data.

### Integrate the Climatiq API
Use our globally distributed REST API with applications running on any device or server located in any data center.

### Access trusted emissions data
Choose among thousands of up-to-date and scientifically vetted emission factors in our open database or import your own to accurately calculate the carbon emissions of any activity.

#### Our mission is to drive climate action through data and insight.

By helping you measure, analyse, and understand how and where your business generates emissions, we make it easy for you to start and scale effective change.

Our easy-to-implement API allows you to collect emissions data, automate carbon emission calculations, and ultimately, to make data-supported decisions on how your business can become more sustainable, fast.

Using the Climatiq REST API, you can take data from your software and systems and automatically transform that it into CO2e values, using emission factors from a range of validated sources available in the Open Emission Factor Database.

Climatiq API

Build an outstanding user experience with premium quality weather data.

### Foreca Weather API - everything you need

On today's competitive app market the ability to do things differently is the key to success. High quality and accurate weather content is equally important also in any weather related solutions, like in IoT, HVAC, energy, agriculture, transportation etc. Foreca Weather API helps you build an outstanding user experience with premium quality accuracy. Foreca Weather API combines accurate weather forecasts and easy-to-use tools for visualising the information.

- Foreca Weather API includes both point forecasts and weather maps in one package.
- Global coverage - weather forecasts for every coordinate in the world.
- Foreca's high forecast accuracy provided in an easy-to-use format.
- Easy to combine with API add-ons.

Foreca Weather API

AccuWeather provides hourly and Minute by Minute forecasts with Superior Accuracy for any longitude/latitude on Earth.

AccuWeather Forecast API has local and international weather forecasts from the most accurate weather forecasting technology featuring up to the minute weather reports. Get forecast information for a specific location. Use the Locations API to find the location Key for you location and use it to get accurate and precise weather reports.

#### Daily
- Get 1 Day of Daily Forecasts.
- Get 5 Day of Daily Forecasts.
- Get 10 Days of Daily Forecasts.
- Get 15 Days of Daily Forecasts.

#### Hourly
- Get 1 Hour of Hourly Forecasts.
- Get 12 Hour of Hourly Forecasts.
- Get 24 Hour of Hourly Forecasts.
- Get 72 Hour of Hourly Forecasts.
- Get 120 Hour of Hourly Forecasts.



Forecast API

A simple but informative API on Air Quality Index from regions all over the world.

Obtain and visualize Air Quality Index data from our Map Tile API, Widget API and JSON API.

#### Map Tile API
The map tile API can be used to show the real-time Air Quality index on a google, bing or openstreet map.

#### Widget API
The widget API can be used to integrate the real-time Air Quality index on any web page.

#### JSON API
The JSON API can be used for advanced programmatic integration:
- Access to more than 11000 station-level and 1000 city-level data.
- Geo-location query (based on latitude/longitude or IP address).
- Individual AQI for all pollutants (PM2.5, PM10, NO2, CO, SO2, Ozone).
- Station name and coordinates.
- Originating EPA name and link.
- Current weather conditions.
- Stations within a map lat/lng bounds.
- Search stations by name.
- Air Quality forecast (for 3~8 days).

AQICN Air Quality Index API

70+ years of global, hourly historical and forecast weather data from NOAA and ECMWF

Oikolab has processed hundreds of terabytes of data to give you access this data in seconds rather than hours, whether you require 1 month or 70 years of historical data so that you can focus on your analysis rather than downloading and processing raw data.

Climate reanalyses combine vast observations from satellites, aircraft, land and sea based weather sensors with atmospheric models to generate consistent time series of multiple climate variables. ERA5 is the latest climate reanalysis produced by ECMWF, providing hourly data on many atmospheric, land-surface and sea-state parameters.

Developers have access to all our data throught the REST API:

- Weather Data.
- Archived Forcasts.
- Ensemble Forecasts.
- Seasonal Forecasts.
- Air Quality Forecasts.

Oikolab API

JSON and XML Weather API and Geolocation Developer API

**JSON and XML Weather API and Geolocation Developer API**
_Designed for developers by developers, Weather API is the ultimate weather and geolocation API trusted by +100K users worldwide. Integrate weather in JS Library._

 **Forecasted and Historical Weather**
Free Weather Forecast JSON and XML

- **Real-time Weather API**
Real-time or current JSON weather and XML weather API provides access to near real-time weather information for millions of locations worldwide.

- **Historical and Future Weather**
14 day hour by hour weather forecast, future weather (upto 300 days ahead) and hourly historical weather (from 2010 onwards) for millions of cities and towns around the world in JSON and XML format.

- **Geolocation API**
Air Quality Data, Time zone, Astronomy, IP lookup, Sports API, Currency API, Map API and Geo API

- **JSON and XML Weather API and Geolocation Developer API**
Hourly weather, history, astronomy, air quality data, sports and much more




WeatherAPI.com

**Easy Global Weather API**
_Single history & forecast Weather API_

- **The best realtime weather data in one API**
Single API Call
A single Weather API request can return past, present and future data

- **Sub-hourly, Hourly and Daily Data**
Our data provides full Sub-hourly, Hourly and Daily Data

- **Current Conditions, Alerts, & Events**
Retrieve real time conditions, weather alerts & details about significant events

- **Kite flying in the weather**
50+ Years of Historical Weather Data
Our historical weather database includes over 100,000 weather stations

- **CSV and JSON Results**
Our weather API provides both rich JSON structures and CSV for easy use

- **Full location address geocoding**
Look up by Address, ZIP Code, Lat/lon & more

Weather API

The High Performance API Service for all of your Weather needs.

**Weather API**
_The High Performance API Service for all of your Weather needs._

Here are some of the highlights abouts Weather API:

- **Simple. Powerful. Reliable.**
Getting access to accurate weather forecasts or historical weather data has never been easier.

- **Unparalleled Forecast Accuracy**
We leverage the power of forecast models, and machine learning to deliver the most accurate weather forecast API on the web. Learn more.

- **Historical Weather**
The most accurate collection of historical weather observations on the web. Backed by multiple data sources including station data, satellite, radar, and more.

- **Hyperlocal Weather**
Get hyperlocal observed weather data, or weather forecasts for any point on the globe.

- **Scale as you need**
Scale your usage to your budget! Start out with our free plan, and upgrade to paid API plan as your weather data needs grow.

- **Blazing speed**
API response times 200 ms or less on average. (Daily average)

- **99.9% uptime guaranteed***
We guarantee a 95.0% uptime for server availability for all paying users, and 99.9% for accounts eligible for our premium users under our SLA

The best weather APIs