Abstract
Delhi, the capital city of India, has an ill repute of a polluted city specifically due to high ambient particulate concentration resulting Hazy conditions. Winter of 2012 in Delhi was characterized with high level of critical pollutants, which in general, were attributed to geographical location of the city, high vehicular and population density. The onset of winter 2012 witnessed hazy and dusty condition, which prevailed for about 20 days (October to November), which is uncommon for this period of the year. No changes in the pattern of polluting activities in Delhi city were observed, which further compelled Delhi Pollution Control Committee to find out the associated reasons. The activities in neighboring states like agricultural waste burning in Punjab and Haryana and development of cyclone on coast of Tamil Nadu during this period might be one of the factored reasons for the hazy conditions. In this study, status of pollutants like particulate matter (PM10 and PM2.5), Nitrogen dioxide, Ozone, Ammonia, Sulfur dioxide and Carbon monoxide and metrological conditions were assessed and compared with 2011 data to find out the cause of extra ordinary hazy condition in Delhi, which induced panic in general population and attracted international media.
Highlights
Air pollution has received significant attention over the past several decades from both the scientific and the environmental risk management communities in India and internationally [1]
A strong correlation was observed between PM10 and PM2.5 (0.96), PM10 and Carbon monoxide (0.83) and PM2.5 and Carbon monoxide (0.80)
A strong correlation was observed between PM10 and PM2.5 (0.95), PM10 and Ammonia (0.85) and PM2.5 and Ammonia (0.80)
Summary
Air pollution has received significant attention over the past several decades from both the scientific and the environmental risk management communities in India and internationally [1]. This is especially true of smog’s two major components: particulate matter (PM) and ground-level ozone (O3). The primary reason for this attention has been the scientific literature, indicating the extensive impacts exerted by these pollutants on human health They can impact the environment, these impacts are less critical at the levels of smog currently experienced in Delhi, capital of the country, India. Urban air pollution is eighth among the top 10 risk factors, and is the most important population health risk factor that cannot be significantly reduced by changes to personal behavior, arguably making it the most important risk factor for which the primary control mechanism is regulatory in nature [3]
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