Smoke Signals: What's Happening in Dibrugarh's Air?

Dibrugarh, a city in the northeastern part of India, has been under the microscope for its air quality. Scientists have been keeping an eye on tiny particles called aerosols that float around in the air. These aerosols can mess with the environment in both the short and long term. Understanding how these particles change can help pinpoint where pollution is coming from. The data collected from 2018 to 2021 shows that during winter and pre-monsoon months, the air is thick with aerosols. This is likely due to human activities and burning biomass. These activities can make the air hazier, which is measured by something called Aerosol Optical Depth (AOD). The AOD values were highest during these seasons, indicating more pollution in the air. The type of aerosols in the air can change throughout the day. This is influenced by various factors, including the weather. For example, fine aerosols make up most of the air volume, but sometimes dust blown in from far away can change the mix, especially during the pre-monsoon months. This is when the air can get really dusty.

Scientists use satellites to measure AOD and compare it with data from ground stations. The results show a good match, with a correlation coefficient of 0. 68. This means the satellite data is reliable for tracking air quality. The volume of aerosols peaks during the pre-monsoon months, reaching up to 0. 11 µm3 µm−2. In other seasons, it stays below 0. 05 µm3 µm−2. This shows how much the air quality can vary throughout the year. Something interesting happened in 2020. The Single Scattering Albedo (SSA) values dropped suddenly, indicating more absorbing aerosols in the air. This means the air was not just hazy but also more harmful to breathe. Over the four years of the study, the overall trend shows that the air is getting warmer due to these aerosols. This is known as positive radiative forcing, and it's a sign that the atmosphere is heating up. So, what does all this mean for Dibrugarh? Well, it's clear that air quality is a big issue, especially during certain times of the year. Understanding these patterns can help the city take steps to improve the air and keep its residents healthy.

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