# Compare air-quality measurements

Compare the same pollutant, averaging period and verification status.

## 1. Choose the appropriate series

Select Romania and pollutant. Use E1a for annually verified series and explicitly label recent E2a data as unverified.

[Air quality measurement time series](https://mariuscomper.uk/cunoastere-deschisa/en/resurse/eea-air-quality/)

## 2. Retain station metadata

Record station, period, unit and averaging duration. Report coverage and missing values before calculating a mean.

[Air quality measurement time series](https://mariuscomper.uk/cunoastere-deschisa/en/resurse/eea-air-quality/)

## 3. Add geographical context

Land cover can provide context at the product’s scale. A 2018 product does not automatically describe the current surroundings of a station.

[CORINE land cover 2018](https://mariuscomper.uk/cunoastere-deschisa/en/resurse/corine-2018/)

## Caution

A station reading does not describe every resident’s exposure. This path supports research, not medical recommendations or real-time alerts.

A comparison stating pollutant, stations, interval, observation coverage and verification status.