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From Singapore's National Environment Agency (NEA) and the Meteorological Service Singapore, through data.gov.sg. Each reading shows the time it was taken. See data credits for the full list of sources.

Official stations publish at different intervals, and sometimes a station is offline. CroAQI shows the source time and never passes off an old reading as current. If fresh readings are unavailable, the app says so. Check your connection and try again in a few minutes.

It looks at five things together: air (PM2.5), heat, UV, rain and wind, along with the activity you've chosen. Then it suggests what to bring and whether now or later is the better time to go. It's general guidance, not medical advice.

Readings come from the nearest official stations, which may be a few kilometres away, and showers in Singapore can be very local. Use the advice as a guide alongside your own judgement.

Not at the moment. CroAQI uses Singapore's official data, so it only covers places in Singapore.

CroAQI Free covers Marina Bay. Membership adds every Singapore neighbourhood, up to 50 saved places, 48-hour planning and Home Screen widgets, and family plans add your Circle. US$4.99 a week or US$49.99 a year for one person, or US$89.99 or US$119 a year for families of up to 4 or 8, each with a 3-day free trial for new subscribers. The App Store shows the price in your local currency before you buy. See plans and prices.

On your iPhone, open Settings, tap your name, then Subscriptions, and choose CroAQI. In the app, Membership → Manage or cancel subscription opens the same screen. Cancel at least 24 hours before your trial ends or your plan renews to avoid the next charge. You keep membership until the end of the trial or the period you paid for. Moving to a bigger family plan starts straight away; moving to a smaller plan, or between weekly and yearly, starts at your next renewal.

Weekly and yearly plans start with a 3-day free trial for new subscribers, once per Apple Account. No payment is due when you start. If you allow notifications, CroAQI reminds you the day before the trial ends. Cancel at least 24 hours before the end and you won't be charged.

A family plan covers up to 4 or 8 people, including you. Invite people to your Circle from the Circle tab; each person signs in on their own phone and gets their own advice. You can also add managed profiles, for example for a child. Family plans don't use Apple Family Sharing.

Sign in to CroAQI with the same email address, then go to Settings → Membership → Restore purchases.

Apple handles all payments and refunds. Request one at reportaproblem.apple.com.

Codes can take a minute to arrive. Check your spam or junk folder, make sure the email address is spelled correctly, and request a new code. If it still doesn't arrive, email us.

In the app, go to Settings → Data & account. Choose Export my data for a copy, or Delete CroAQI account to erase your account. Deleting your account does not cancel an App Store subscription; cancel that in your iPhone settings too.

No. There are no ads and no tracking. Read the privacy policy for the details.