Kazakhstan was the top destination country for Russian immigrants in 2022, a year when Russian emigration sharply increased due to new international sanctions and war mobilization. The circumstances offer a rare opportunity to explore how a large sudden skill-abundant immigration within an economic union affects firm employment dynamics for a middle-income receiving country. Kazakhstan and Russia share the world's longest continuous land border, so immigration effects are regionally dispersed rather than concentrated solely in cities, and Kazakhstan offers business registers data to explore firm-level employment dynamics. Absent fine regional data on immigration flows, our empirical approach uses a pre-war share of the Russian population in 215 districts of Kazakhstan as a reduced-form instrument for the treatment of Russian immigration. We find no pre-war trends in firm employment growth related to the Russian district population shares. Using difference-in-differences estimation, we find large effects of 2022 Russian immigration on the employment growth for Kazakhstan's incumbent firms in more affected regions. The employment growth is larger for small firms, young foreign-owned firms, older domestic firms, and ICT firms, and results are robust to the exclusion or inclusion of Kazakhstan's two major cities of Almaty and Astana. We estimate that Kazakhstan's regions, excluding the two major cities, would have experienced a private sector employment fall of 86,500 in 2022 rather than the actual increase of 21,500 if Russian immigration flows had not occurred.
We find that air pollution increases crime in a city that ranks in the worst two percentiles worldwide for dirty winter air. Our identification strategy employs distinct geographic features of Almaty, Kazakhstan: cleaner mountain winds and frequent temperature inversions. Using these variables to instrument for PM2.5 air pollution, we estimate a PM2.5 elasticity of the expected crime rate more than four times as large as similar estimates from cleaner cities. Among crime types, we estimate statistically significant effects of air pollution on property crime, and we find no evidence of an effect on violent crime. These results are consistent with theory that air pollution induces higher discounting rather than aggression. We extend this theory and find that whether air pollution has distinct effects on crimes of varying severity depends on whether the population is more heterogenous in the outside option or in the discount factor. Using microdata on crime severity, we find statistically significant increases in both major and minor crime rates from air pollution, and we fail to reject common PM2.5 elasticities of minor and major crime rates. The greater scale of major crimes implies that they contribute more to the total crime rate increase from air pollution.