Today's Air Quality Snapshot
As of today, Kolkata is experiencing a moderate level of air quality, registering an Air Quality Index (AQI) of 55. This reading indicates that the air is acceptable, though it may pose a slight risk to individuals
who are exceptionally sensitive to air pollution. The primary contributors to this AQI are particulate matter, specifically PM2.5 which stands at 33 µg/m³, and PM10 at 39 µg/m³. Additionally, ozone (O3) levels are measured at 15 ppb, and carbon monoxide (CO) is at 260 ppb. While the CO level is unlikely to cause significant issues for the general population, those with heightened sensitivities might notice mild adverse effects. The prevailing temperature of 28°C makes outdoor conditions generally favorable for most activities, but it is advisable for sensitive groups to limit extended periods spent outdoors.
Major Pollutant Breakdown
Delving deeper into the components of Kolkata's air, we identify the main pollutants influencing today's AQI. Particulate Matter, a significant concern, is present in two forms: PM2.5, fine particles with a diameter of 33 µg/m³, and PM10, coarser particles at 39 µg/m³. These microscopic particles can penetrate deep into the lungs and bloodstream, potentially leading to respiratory and cardiovascular issues. Carbon Monoxide (CO) is detected at 260 ppb; while this level is not acutely dangerous for most, it can contribute to discomfort for sensitive individuals. Sulphur Dioxide (SO2) is present in very low concentrations at 2 ppb, and Nitrogen Dioxide (NO2) is at 8 ppb, both of which are well within acceptable limits. Ozone (O3), a gas that forms under sunlight, is measured at 15 ppb and is another factor contributing to the overall air quality assessment.
Weekly Air Quality Trends
Examining the air quality trend in Kolkata over the past week reveals fluctuations in the AQI. On March 12th, the index stood at 157, classifying the air as 'Poor.' A noticeable improvement followed, with the AQI dropping to 93 on March 13th and continuing to decrease to 82 on March 14th, both falling into the 'Moderate' category. This trend of moderate air quality persisted through the week, with the AQI remaining at 65 on March 15th and 16th, and stabilizing at 52 on March 17th and 18th. Today, March 19th, the AQI is 55, maintaining the 'Moderate' status. This consistent 'Moderate' rating over several days, following a 'Poor' day, suggests a general improvement and stabilization in the city's air quality, predominantly influenced by PM2.5 and PM10 levels.
Understanding Air Quality Levels
The Air Quality Index (AQI) is a standardized system used to communicate how polluted the air is currently or how polluted it is forecast to become. It categorizes air quality into distinct levels, each with associated health implications. These levels range from 'Good,' typically below 50, where air quality is considered satisfactory and poses minimal risk, to 'Moderate,' between 51 and 100, where sensitive individuals may experience some health effects. Beyond this lies 'Poor' air quality (101-150), followed by 'Unhealthy' (151-200), 'Very Unhealthy' (201-300), and finally 'Hazardous' (301+), where everyone may experience serious health effects. Today's AQI of 55 in Kolkata places it in the 'Moderate' range, signifying acceptable air for general populations but caution for those more susceptible to pollutants.
