People burn crackers world over on different occasions in different countries to express their happiness. Fireworks in large amounts aggravate the level of air pollutants and cause significant short-term air quality degradation with possible impact on human health. Fine particles (PM2.5 <2.5 μm), which may pose detrimental effects on human health and ecosystems were monitored in a residential area of Lucknow city to assess the elevated level due to bursting of firecrackers during Diwali festival.