How we handle the science

Every impact claim is a chain: what happens → how → so. Each carries the exact source and the date we checked it. If a behaviour has no credible source for a number, we show it without a number rather than guess. Missing beats wrong.

We never paint a foreign figure onto an Indian claim without saying so. Where a number comes from abroad (say WHO's European noise thresholds), the card says so and shows it for the mechanism, not as the Indian number.

The strength badge

Every claim wears a plain-language badge so you always know how solid it is:

• Strongest - many studies agree

  Systematic reviews, controlled trials, or WHO guidelines. A number may be shown.

• Official count - government record

  A national statistic (e.g. MoRTH road-death figures). A number may be shown.

• Suggestive - measured in the real world

  Observational or ecological studies. Shown as an association, never a bare percentage.

• How it works - the size isn't measured here

  The mechanism is understood but not quantified. No number is shown.