The house has a dirt-floor crawl spaces (1m high). The emission rate of radon into the crawl space is 0.6 pCi/m^2-s. An exhaust system was added to provide 1 air exchange per hour (ACH) in the crawl space. The outdoor concentration of radon is 1 pCi/L. Estimate the radon concentration in the crawl space(in pCi/L).
Note, no other demensions were given.