# API Ninjas, free: Air quality API

> Get air quality by city or location coordinates (latitude/longitude). Returns the air quality index (AQI) and concentrations of major pollutants.

API Ninjas's air quality API on its Free plan. It costs $0.00 per 1,000 places. It returns 2 of the 6 key fields we check: Particles, Gases.
We rank 94 plans by price. [OpenWeather's £370 monthly plan](https://datacircle.dev/air-quality-apis/openweather/370-monthly-professional-get-data-2-5-air-pollution/llms.txt) is the cheapest paid plan per 1,000 places: $0.00049.
[WeatherAPI.com](https://datacircle.dev/air-quality-apis/weatherapi-com/7-monthly/llms.txt), [Open-Meteo](https://datacircle.dev/air-quality-apis/open-meteo/99-monthly-api-professional-get-v1-air-quality-air-quality/llms.txt) and [Weatherbit](https://datacircle.dev/air-quality-apis/weatherbit/495-monthly-business-get-v2-0-forecast-airquality/llms.txt) are the best air quality API providers in our benchmark.

- This page: https://datacircle.dev/air-quality-apis/api-ninjas/free
- [Best air quality API in 2026: pricing compared](https://datacircle.dev/best-air-quality-api.txt)
- Get it: https://api-ninjas.com/pricing
- Request: `GET https://api.api-ninjas.com/v1/airquality`
- API key: with the plan, on https://api-ninjas.com/pricing
- Its API docs: https://api-ninjas.com/api/airquality
- Sold by: API Ninjas (https://api-ninjas.com)
- Checked: 2026-10-30

## In the answer

- Completeness: 33%
- Particles: ✓
- Gases: ✓

## Price

- $ per 1,000 places: $0.00
- Per: call
- Billing: free

## Charges

- Also pays for: from the same budget: 283 other calls

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Get air quality by city or location coordinates (latitude/longitude). Returns the air quality index (AQI) and concentrations of major pollutants.

## Data

- Keep data: for as long as your paid Subscription Plan remains active: once it ends or is canceled, you must immediately cease all commercial use of the Services and Output, and you may not continue to display, use, or provide Output in your commercial applications, products, or to your clients. Data caching/storing allowed: Yes on Business, Professional and Enterprise, No on Developer and Free
- Use data: If you are using the Free Subscription Plan, you may use the Services and Output solely for personal, non-commercial purposes and for development, testing, or evaluation of your Customer Applications. You may NOT: Use the Services or Output in any commercial environment. Use the Services or Output in any commercial product, service, or application, whether internal or external Share, distribute, or make available any Output or content from the Services to any third party in any form [...] Commercial use of the Services or Output is permitted while your paid Subscription Plan remains active. [...] You are strictly prohibited from using any information or Output from the Services to develop, train, maintain, or operate any API, software, database, or service that competes with API Ninjas—regardless of whether it is available on our platform or elsewhere. This prohibition extends to repackaging, redistributing, or making the Output or data accessible in any way that would compete with or substitute for our Services. [...] You agree NOT to use the Services for any purpose that: [...] Resells, redistributes, or sublicenses API access without authorization Creates competing products or services using our APIs White-labels or rebrands Output as your own data source Uses the Free plan for commercial purposes Shares or transfers API Keys to unauthorized parties [...] Attribution required: Yes (Free plan)

## Plan

- Pay: $0
- You get: 3,000 requests a month
- Enough for: 3,000 calls a month

## Rate limit

- Per second: 0.028
- Batch: 1

## Speed

- Median: 0.45 s

## The call

- You send: lat, lon. Optional: city, state, country
- Method: GET
- Path: /v1/airquality

## About the plan

- Plan: Free
- Who can get it: anyone 18 or over

## The 13 fields the plan's answer can hold

overall AQI, carbon monoxide concentration, carbon monoxide AQI, nitrogen dioxide concentration, nitrogen dioxide AQI, ozone concentration, ozone AQI, sulfur dioxide concentration, sulfur dioxide AQI, PM2.5 concentration, PM2.5 AQI, PM10 concentration, PM10 AQI

## API Ninjas's plans (8)

- [API Ninjas, free](https://datacircle.dev/air-quality-apis/api-ninjas/free/llms.txt): $0.00 per 1,000, 33% complete
- [API Ninjas, $59 monthly](https://datacircle.dev/air-quality-apis/api-ninjas/59-monthly/llms.txt): $0.59 per 1,000, 33% complete
- [API Ninjas, $149 monthly](https://datacircle.dev/air-quality-apis/api-ninjas/149-monthly/llms.txt): $0.149 per 1,000, 33% complete
- [API Ninjas, $299 monthly](https://datacircle.dev/air-quality-apis/api-ninjas/299-monthly/llms.txt): $0.03 per 1,000, 33% complete
- [API Ninjas, $468 yearly](https://datacircle.dev/air-quality-apis/api-ninjas/468-yearly/llms.txt): $0.39 per 1,000, 33% complete
- [API Ninjas, $1,188 yearly](https://datacircle.dev/air-quality-apis/api-ninjas/1188-yearly/llms.txt): $0.099 per 1,000, 33% complete
- [API Ninjas, $2,388 yearly](https://datacircle.dev/air-quality-apis/api-ninjas/2388-yearly/llms.txt): $0.02 per 1,000, 33% complete
- [API Ninjas, contact us](https://datacircle.dev/air-quality-apis/api-ninjas/contact-us/llms.txt): 33% complete

## API Ninjas's calls for this API (1)

- `GET /v1/airquality`: [API Ninjas, free](https://datacircle.dev/air-quality-apis/api-ninjas/free/llms.txt)

## API Ninjas's APIs (7)

- [API Ninjas: air quality API pricing, 8 plans](https://datacircle.dev/air-quality-apis/api-ninjas/free/llms.txt)
- [API Ninjas: current weather API pricing, 8 plans](https://datacircle.dev/current-weather-apis/api-ninjas/free/llms.txt)
- [API Ninjas: email verification API pricing, 8 plans](https://datacircle.dev/validate-email-apis/api-ninjas/free/llms.txt)
- [API Ninjas: VIN decoder API pricing, 8 plans](https://datacircle.dev/vin-decoder-apis/api-ninjas/free/llms.txt)
- [API Ninjas: weather forecast API pricing, 8 plans](https://datacircle.dev/weather-forecast-apis/api-ninjas/free/llms.txt)
- [API Ninjas: web scraping API pricing, 8 plans](https://datacircle.dev/web-scraping-apis/api-ninjas/free/llms.txt)
- [API Ninjas: phone validation API pricing, 8 plans, GET /v1/phonelookup](https://datacircle.dev/validate-phone-apis/api-ninjas/free-get-v1-phonelookup/llms.txt)
- [API Ninjas: phone validation API pricing, 8 plans, GET /v1/validatephone](https://datacircle.dev/validate-phone-apis/api-ninjas/free-get-v1-validatephone/llms.txt)

## API Ninjas: air quality API alternatives

- [Seniverse, CNY 600 pack, Extra visits 6,000,000 (额外访问量), GET /v3/air/hourly.json](https://datacircle.dev/air-quality-apis/seniverse/cny-600-pack-extra-visits-6000000-get-v3-air-hourly-json/llms.txt): $0.015 per 1,000, 33% complete, 24 hours
- [Botoi, $49 monthly](https://datacircle.dev/air-quality-apis/botoi/49-monthly/llms.txt): $0.016 per 1,000, 67% complete, live
- [Meteosource, $199 monthly](https://datacircle.dev/air-quality-apis/meteosource/199-monthly/llms.txt): $0.017 per 1,000, 33% complete
- [Open-Meteo, €1,099 yearly, API Professional, GET /v1/air-quality, Air quality](https://datacircle.dev/air-quality-apis/open-meteo/1099-yearly-api-professional-get-v1-air-quality-air-quality/llms.txt): $0.021 per 1,000, 100% complete, live

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-30.

- https://api-ninjas.com
- https://api-ninjas.com/api/airquality
- https://api-ninjas.com/error-codes
- https://api-ninjas.com/openapi.json
- https://api-ninjas.com/pricing
- https://api-ninjas.com/tos