%0 Journal Article %B Atmospheric Measurement Techniques %D 2023 %P 4357-4374 %R 10.5194/amt-16-4357-2023 %T Seasonally optimized calibrations improve low-cost sensor performance: long-term field evaluation of PurpleAir sensors in urban and rural India %U https://amt.copernicus.org/articles/16/4357/2023/ %V 16 %9 Research Article