It was the London of the 20th century mired in low hanging pollution that infiltrated the foggy city, when the word “smog” was coined for the first time. Today many Indian cities face this lethal condition. And many more will soon face yet more dire consequences if corrective steps are not taken. A known reason for pollution laden air is of course our ever increasing vehicular traffic. Add to this industrial smoke and effluents coming out everywhere. Lace this with construction dust, crop burning smoke and mushrooming thermal power stations. Soon our towns and villages too will be engulfed in this all pervasive smoggy grip.
There was a time when we actually romanticized the morning mist and thought of it as clouds settled on earth! The charming smoky invisible pall was actually cast by water droplets in the air! Sunlight reflecting off this hazy atmosphere was sans pollution. With the land cooling down, air became less able to hold moisture and water condensed in the air. This is the fog that happens in early winter mornings that automatically gets erased when the sun comes out.
There are all kinds of fog. Radiation fog is when temperatures are cold and there are no winds. Valley fog is fog that fills a valley and may last up to days because of the unique topographical layout. Upslope fog happens on hillsides while coastal fog occurs on coastlines. When fog forms ice crystals over surfaces it’s known as freezing fog. But fog turns into nasty haze when pollutants carried by wind currents gather and settle with the fog. This pollution laden hazy fog full of low-lying ozone is what is now commonly known as smog.
Smog is a killer. It makes you cough and burns eyes since it’s made up of ozone. When pollutants like nitrogen oxides react with the sunlight to form ozone then it’s not such a good idea to breathe it. Aside from sore throats and eye irritation it can lead up to chronic asthma. It also severely impacts productivity of agriculture in rural areas. These symptoms are now very common in most Indian towns and cities.
Smog is now a real threat to our social and ecological damage. Air pollution is certainly a very serious issue. In rural areas it is fuel-wood and biomass burning and in urban sites it is adulterated fuel, vehicle emission, traffic congestion and factory smoke that are major sources of pollutants that smog up particulate pollution to gag people. Although India has a low per capita emissions of greenhouse gases but the country as a whole is the third largest polluter after China and USA.
Continued exposure to particulate matter leads to respiratory and cardiovascular diseases such as asthma, bronchitis, lung cancer and heart attacks. Since 2010 studies have been revealing that outdoor air pollution is the fifth-largest killer in India. Around 620,000 early-deaths occurred from air pollution-related diseases in 2010 itself. According to a WHO study 13 of the 20 most-polluted cities in the world are in India. And the 2016 Environmental Performance Index ranked India 141 out of 180 countries.
There has been vociferous activism mostly by science backed NGOs that spurred action for improvements in air quality testing and monitoring. The Air (Prevention and Control of Pollution) Act was passed in 1981 to regulate air pollution. In 2015 the government together with IIT Kanpur launched the National Air Quality Index. In the last fifteen years India has been working unremittingly on regulatory reforms for improving its air quality. Most Indian cities however continue to violate air quality PM10 targets.
Respirable particulate matter pollution continues to be a key challenge. In May 2014 the World Health Organisation announced New Delhi as the most polluted city in the world. In November 2016, the great smog of Delhi created an environmental event that saw the city and neighboring region covered in dense smog. The present scenario is not much different and once again north India is struck by smoggy conditions with thick haze and air quality remaining at hazardous levels. Aside from the NCR area many more cities are experiencing smog with people literally gasping for breath. Smog-apocalypse or death by breathing is actually a fact now. Click on the link below to check out air pollution in India – Real-time Air Quality Index Visual Map: