Media Center
Weekly Air Quality in Selected Towns of Sri Lanka (29 Dec – 5 Jan 2024)
From the 30th December 2024 to 5th January 2025, Trincomalee, Colombo (Gregory Road) and Battaramulla (CEA & Pelawatta) experienced unhealthy levels of air pollution (AQI 101 – 150); Moderate (AQI 51-100) in Digana, Kurunegala, Colombo (US Embassy), Puttalam and Ambalantota.
Air pollution in North India remained severe this week. At the start of the week, two cyclonic vortices were present near the Southern coast of Sri Lanka but later moved away, alerting wind patterns. From January 2nd, northerly winds carried polluted air from India to Sri Lanka, causing a rise in air pollution across the northern provinces, particularly from January 2nd to 4th. Due to the seasonal wind patterns, air pollution stayed high throughout the week.
Trincomalee recorded the highest weekly average AQI of 164. Akurana recorded the lowest weekly AQI of 9.
Observed fine particulate measurements by the minute for last week
The AQ variation at a fine temporal scale is shown in Colombo and Pelawatte for last three days. The peak value in Colombo was about 150 and Pelawatte was about 160.
Air Quality impact on human health
Fine particulate matter (PM 2.5) are generally 2.5 microns and smaller in size. Such particles are inhalable and easily lodges inside the lungs reducing capacity. PM2.5 is a concern for people’s health when levels in the air are high. The levels of risk are shown in the dial shown against the US EPA air quality standards. AQ has a scale that run from 0-500, that tells you how clean or polluted your air is. Each level on the scale corresponds to a different level of health concern.
AIR QUALITY BASICS
Air pollution, a widely- talked and argued topic today has been a primary cause of unforeseen climatic changes, many health problems associated with respiratory diseases and ecosystem damage. Vehicular and industrial emissions, dust, burning of fossil fuels, open burning of garbage waste and natural phenomena such as volcanoes, wildfires and pollen contribute to air pollution. Polluted air consists of both particulate matter of fine dimensions and gaseous matter. The presence of these impurities decreases the pureness of the air we breathe.
AQI
United States Environmental Protection Agency (US EPA) has set up a standard to measure the level of air pollution by the following 5 major air pollutants:
- Ground- level ozone (O3)
- Particle pollution (PM2.5 and PM10)
- Carbon monoxide (CO)
- Sulphur dioxide (SO2)
- Nitrogen dioxide (NO2)
Particulate matter of diameter less than 2.5 micrometers (PM2.5) and diameter less than 10 micrometers (PM10) and gases, ozone, carbon monoxide, sulphur dioxide and nitrogen dioxide have been identified as major air pollutants.
The AQI standard for ozone and particle pollution according to US EPA comprises of six categories. Each category is assigned a specific colour and corresponds to a different level of health concern. As the scale grows the air quality turns from good to extremely unhealthy.
Access to real- time air quality data from laser air quality sensoring instruments operated by FECT is available at www.cleanair.lk
