Air Quality
Free tierPollutant readings and AQI from 30,000 monitoring stations.
About this API
Current, forecast, and historical air quality with PM2.5, PM10, ozone, nitrogen dioxide, sulphur dioxide, and carbon monoxide concentrations, normalized to US EPA and European AQI scales with health recommendations.
Common use cases
Quickstart
Every Zephiel API uses the same base URL, the same key header, and the same error envelope.
curl -X GET "https://zephiel.com/api/v1/air-quality/current" \
-H "X-Zephiel-Key: $ZEPHIEL_API_KEY" \
-H "Accept: application/json"Example response
{
"aqi_us": 62,
"category": "Moderate",
"pollutants": { "pm2_5": 17.8, "pm10": 41.2, "o3": 54.1 },
"dominant": "pm2_5"
}/v1/air-quality/currentCurrent AQI and pollutant levels/v1/air-quality/forecastHourly AQI forecast up to 5 days/v1/air-quality/stationsNearby monitoring stationsAll endpoints return JSON and accept the X-Zephiel-Key header. Rate limits are enforced per plan and reported in X-RateLimit-Remaining.
Plans can be changed or cancelled at any time. Overage is charged per 1,000 requests rather than hard-blocking your traffic.
Free
100 requests/mo
5 req/min
Free
- JSON output format — included
- HTTPS encryption — included
- API key authentication — included
- Standard endpoints — included
- Community support — included
- CSV output format — not included
- Email support — not included
- Usage analytics and alerts — not included
- 99.9% uptime SLA — not included
- Webhooks — not included
- Priority support — not included
- Custom rate limits — not included
- 99.99% uptime SLA — not included
- Dedicated success manager — not included
- SSO / SAML — not included
- Custom SLA, DPA, and BAA — not included
- Private deployment option — not included
- Volume pricing — not included
Starter
10,000 requests/mo
60 req/min
$9/month
- JSON output format — included
- HTTPS encryption — included
- API key authentication — included
- Standard endpoints — included
- Community support — included
- CSV output format — included
- Email support — included
- Usage analytics and alerts — included
- 99.9% uptime SLA — included
- Webhooks — not included
- Priority support — not included
- Custom rate limits — not included
- 99.99% uptime SLA — not included
- Dedicated success manager — not included
- SSO / SAML — not included
- Custom SLA, DPA, and BAA — not included
- Private deployment option — not included
- Volume pricing — not included
Most popular
Pro
250,000 requests/mo
600 req/min
$36/month
- JSON output format — included
- HTTPS encryption — included
- API key authentication — included
- Standard endpoints — included
- Community support — included
- CSV output format — included
- Email support — included
- Usage analytics and alerts — included
- 99.9% uptime SLA — included
- Webhooks — included
- Priority support — included
- Custom rate limits — included
- 99.99% uptime SLA — included
- Dedicated success manager — not included
- SSO / SAML — not included
- Custom SLA, DPA, and BAA — not included
- Private deployment option — not included
- Volume pricing — not included
Enterprise
Unlimited requests
Custom
$126/month
- JSON output format — included
- HTTPS encryption — included
- API key authentication — included
- Standard endpoints — included
- Community support — included
- CSV output format — included
- Email support — included
- Usage analytics and alerts — included
- 99.9% uptime SLA — included
- Webhooks — included
- Priority support — included
- Custom rate limits — included
- 99.99% uptime SLA — included
- Dedicated success manager — included
- SSO / SAML — included
- Custom SLA, DPA, and BAA — included
- Private deployment option — included
- Volume pricing — included
4.6
12 reviews
Fatima Bello
Operations Director
One key made the difference
Adding Air Quality took ten minutes because the credential already existed. The vendor onboarding we skipped would have taken longer than the integration.
Pieter de Vries
Staff Engineer
Solved Health apps for us
We brought Air Quality in for Health apps and it has not needed revisiting since. The response shape matched the documentation on the first call, which is rarer than it should be.
Olamide Fashola
Technical Lead
Fast enough to sit in the request path
88ms median is quick enough that we call Air Quality synchronously rather than queueing it. That removed a whole background worker from our architecture.
Isabella Ferreira
Software Engineer
Free tier covered the whole prototype
I built the entire esg reporting flow against Air Quality before anyone had to approve a purchase order. By the time we paid, we already knew it worked.
Arjun Patel
Senior Engineer
Replaced a fragile in-house pollution job
We had a script doing outdoor event planning that broke every few months and only one person understood. Air Quality replaced it in an afternoon and nobody maintains it now.
Sarah Whitfield
Founder
Errors are actually readable
When something goes wrong Air Quality says what and why, with a code I can branch on. I have integrated aqi services that return 200 with an error buried in the body, so this is a relief.
Ngozi Eze
Systems Analyst
Held up under real load
We push Air Quality hard during peak and latency has stayed flat. No throttling surprises, no silent degradation — the numbers on the listing matched what we measured.
Carlos Mendez
Engineering Manager
Good coverage for pm2.5
We checked Air Quality against our own pm2.5 reference data before committing. Coverage was better than the incumbent we were paying four times as much for.
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