Impact of Crop Residue Burning on Air Quality

Open-field combustion of harvested crop residues is a widespread post-harvest practice that emits large quantities of particulate matter and trace gases, with significant ramifications for regional and global air quality. Burning of straw, stubble and other agricultural residues releases fine particulate matter (PM2.5), black carbon and reactive nitrogen species, exacerbating haze events and reducing atmospheric visibility. These emissions foster adverse health outcomes, including respiratory and cardiovascular illness, and contribute to climate forcing through aerosol–radiation interactions. In major farming regions such as the Indo-Gangetic Plain, seasonal residue fires coincide with meteorological transitions that often confine pollutants near the surface, resulting in episodic peaks of hazardous pollution. Beyond immediate air quality deterioration, open burning undermines soil fertility by depleting organic carbon and nutrients, thereby creating a negative feedback on agricultural productivity. Integrating mechanised residue management, energy recovery and sustainable soil amendments is critical to mitigate these multifaceted impacts and to reconcile agricultural practices with public health and environmental objectives.

Research from Nature Portfolio

Recent studies have employed high-resolution atmospheric modelling and satellite observations to dissect the seasonal and meteorological drivers of particulate pollution associated with biomass burning. One investigation mapped the evolution of PM2.5 concentrations across a major northern plain over the post-monsoon to winter transition, revealing that abundant biomass-burning emissions during early autumn combine with shallowing boundary layers and weaker winds to produce widespread wintertime air stagnation and surface pollution. A complementary analysis linked increases in crop productivity with satellite-observed fire counts, demonstrating that rising yields in cereal cultivation correlate with enhanced post-harvest fires and a parallel surge in aerosol loading over downwind urban centres. These findings underline the dynamic interplay between agronomic trends, biomass-burning emissions and meteorological confinement in shaping regional air quality extremes.

Impact of Crop Residue Burning on Air Quality publication trend

The graph below shows the total number of articles in impact of crop residue burning on air quality across all publications each year (not limited to Nature Index journals).

Technical terms

PM2.5: Fine inhalable particulate matter with aerodynamic diameter ≤2.5 µm, capable of deep lung penetration and associated with health risks.

Atmospheric Boundary Layer: The lowest part of the atmosphere directly influenced by surface processes, whose height governs pollutant dispersion.

Biomass-Burning Emissions: Gaseous and particulate pollutants released during combustion of organic agricultural or natural vegetation.

Ventilation Coefficient: A meteorological index combining boundary layer height and wind speed to quantify atmospheric dilution capacity.

References

1. Economics of Crop Residue Management. Annual Review of Resource Economics (2023).
2. Emission of Air Pollutants from Crop Residue Burning in India. Aerosol and Air Quality Research (2014).
3. On the widespread enhancement in fine particulate matter across the Indo-Gangetic Plain towards winter. Scientific Reports (2020).
4. Connecting Crop Productivity, Residue Fires, and Air Quality over Northern India. Scientific Reports (2019).
5. Crop residue recycling for economic and environmental sustainability: The case of India. Open Agriculture (2017).
6. Vegetation fires, absorbing aerosols and smoke plume characteristics in diverse biomass burning regions of Asia. Environmental Research Letters (2015).
7. Nexus Between Crop Residue Burning, Bioeconomy and Sustainable Development Goals Over North-Western India. Frontiers in Energy Research (2021).
8. Post-monsoon air quality degradation across Northern India: assessing the impact of policy-related shifts in timing and amount of crop residue burnt. Environmental Research Letters (2020).