An assessment of seasonal, monthly and diurnal variations of ambient air quality in the Gurugram city (Haryana)

Gurugram is emerging as one of India's most advanced cities. The combined impact of industrial and vehicular emissions makes the environment toxic. Recently, Gurugram has experienced severe air quality. In the present work, an assessment of seasonal, monthly, and diurnal variations of ambient air quality was carried out in Gurugram during the period of March 2021 to 2022 February. Seasonal and monthly concentrations of key air pollutants like particulate matter (PM2.5), nitrogen dioxide (NO2), carbon monoxide (CO) and ozone (O3) were examined at Vikas sadan, Gwal Pahari and Teri Gram in Gurugram city to study the most polluted seasons and months. Significantly higher mean concentrations of Particulate matter PM2.5 (406.94 μgm−3) and NO2 (353.96ppb) were seen during the colder months and seasons. O3 showed a consistent trend with variations during the year, with the highest concentration in winter (106.35µg/m3). PM2.5 and NO2 concentrations during the night were greater for all seasons when compared to diurnal values. O3 concentrations displayed diurnal tendencies that were the opposite of those of NO2 concentrations. The highest concentrations of ambient PM2.5, NO2, and CO were observed at the Vikas Sadan Monitoring Station. While the NISE Gwal Pahari station showed greater O3 values. The findings highlight the necessity of efficient air pollution control in Gurugram. To prevent public exposure to air pollutants, preventive measures like green spaces, using public transport, etc. must be adopted. The study contributes to a better understanding of air pollution by seasonal, monthly and diurnal assessment in the city of Gurugram

Clinico-etiological pattern of lower gastrointestinal bleeding in children (5-18 years age group) at a tertiary care center in central India

Background: Lower gastrointestinal bleeding (LGIB), defined as bleeding occurring distal to the ligament of Treitz, is a common presenting symptom in pediatric patients. Objective: To understand the clinico-etiological pattern of LGIB in children in the age group 5-18 years. Materials and Methods: This prospective study was carried out at a tertiary health-care center in central India between January 2011 and August 2012. We consecutively enrolled all patients in the age group 5-18 years who came to our center with gross LGIB or two consecutive positive occult blood tests with at least 1-week interval between tests. All patients underwent colonoscopy (small, flexible Olympus PCF-20 colonoscope) and the findings were recorded. The procedure was done only after proper informed consent from the parents. Results: Total 38 patients were included in the study with above-mentioned inclusion and exclusion criteria, during the study period. Male to female ratio in LGIB was 2.16:1. LGIB was most common in children aged 5-10 years (63.1%), followed by 10-14 years (26.3%). Hematochezia was the most common presenting symptom (78.9%) followed by melena (21.1%). The most common causes of LGIB were colitis and colorectal polyp (31.6% each) followed by anal fissures (21.1%). Anemia was present in 68.4% patients at the time of presentation. Recurrence of LGIB was noted in 18 (47.4%) patients. Conclusion: We conclude that LGIB is most common in 5-10 years of children (school age) with hematochezia as the most common presenting symptom. Causes of LGIB in children in developing countries are same as developed countries (polyps and colitis being most common, followed by anal fissure), but further studies are required to determine the significant correlation between findings