In Sri Lanka, schools were forced to close on Friday last week owing to high levels of pollution pulled in from India via Cyclone Mandous. The cyclone was situated in the Bay of Bengal, with winds blowing anti-clockwise around the central low pressure, sweeping the polluted air from India across the Palk strait into Sri Lanka. Subsequently, this merged with Sri Lanka’s local air pollution, leading to unhealthy pollutant concentrations that created a haze across parts of the country, including the capital, Colombo.
Most people are aware of air pollutants, such as carbon dioxide and methane, and the impacts they have in contributing to global warming. However, other air pollutants pose a more immediate threat to human health. Particulate matter refers to tiny particles or droplets in the air, and is split into two categories depending on diameter; up to 2.5 microns (0.0025mm, PM2.5) or up to 10 microns (0.01mm, PM10).
