Open Knowledge

Pollutant Emissions 20% open


What data is expected?

Aggregate data about the emission of air pollutants especially those potentially harmful to human health (although it is not a requirement to include information on greenhouse gas emissions). Aggregate means national-level or available for at least three major cities. In order to satisfy the minimum requirements for this category, data must be available for the following pollutants and meet the following minimum criteria:

  • Particulate matter (PM) Levels
  • Sulphur oxides (SOx)
  • Nitrogen oxides (NOx)
  • Volatile organic compounds (VOCs)
  • Carbon monoxide (CO)
  • Updated on at least once a week.
  • Measured either at a national level by regions or at leasts in 3 big cities.

What data is available

  •   Openly licensed? No (No URL given)
  •   Is the data available for free? No
  •   Is the data machine readable? No (n/a)
  •   Available in bulk? No
  •   Is the data provided on a timely and up to date basis? Yes
  •   Publicly available? No(as Air Pollutant Index of Malaysia published by Department of Environment's)
  •   Is data in digital form? Yes
  •   Is the data available online? No (No URL given)
  •   Does the data exist? Yes


the data is been been Monitor for PM CO AND SOx no Monitor data for NOx exsit maybe the data shold be Considered not exist but the raw data of air Pollutant is given so its Considered not Publicly available the data online is here- and its givs as a vale of Air Pollutant Index

Air Pollutant Index of Malaysia Aggregate data about the emission of air pollutants especially those potentially harmful to human health (althoug The Malaysian Air Quality Guidelines (MAAGs) which form the basis for calculating the API are presented in Table 1. These guidelines have been derived from available scientific and human health data, and basically represent "safe levels" below which no adverse health effects have been observed. The MAAGs are generally comparable to the corresponding air quality standards recommended by the World Health Organization and other countries.

The averaging time, which varies from 1 to 24 hours for the different air pollutants in MAAGs, represents the period of time over which measurements is monitored and reported for the assessment of human health impacts of specific air pollutants. As such, the air pollution indices are normally monitored and reported for the same averaging times as those employed for the air quality standards/guidelines.

The API values are reported for varying averaging time as follows:

a) PM10 and SO2 on 24-hour running averages. b) CO on 8-hour running averages. c) NO2 and O3 on 1-hour running averages.

The API for PM10 reflects specifically levels of particulate matter with a diameter of less than 10 micron pollution and it may not be linked directly to visibility factors, as visibility is often determined by results of semi-quantitative observations over relatively shorter time periods.

The API value reported for a given time period represents the highest API value among all the sub-APIs calculated during that particular time period. The predominant parameter contributing towards a particular API value is normally indicated alongside the API value. This approach is an effort to promote a uniform and comparable API system. Ideally, all sub-API values exceeding the API 100 threshold limit should also be reported in addition to the predominant API value per se.

To determine the API for a given time period, the sub-index values (sub-API) for all 5 air pollutants included in the API system are first calculated using the above mentioned sub-index functions for the air quality data collected from the Continuous Air Quality Monitoring Stations (CAQMs). The corresponding air quality data are subjected to the necessary quality control processes and quality assurance procedures, prior to the sub-index calculations. Source of information -

Reviewer comments




  • yar michl


  • Hazwany Jamaluddin