From Glossary of Meteorology
The burning of vegetation over large tracts of land, usually in tropical countries.
This biomass burning restores nutrients to the soil, but also causes plumes of smoke containing partially burnt gases, secondary pollutants such as ozone, and particles that can extend downwind for hundreds of kilometers.
Crutzen, P. J., and M. O. Andreae 1990. Biomass burning in the tropics: Impact on atmospheric chemistry and biogeochemical cycles. Science. 250. 1669–1678.
Crutzen, P. J., L. E. Heidt, J. P. Krasnec, W. H. Pollock, and W. Seiler 1979. Biomass burning as a source of atmospheric gases CO, H2, N2O, CH3Cl, and COS. Nature. 282. 253–256.