The objective of the present study was to mitigate ammonia (NH₃), methane (CH₄), and air pollutants from lactating dairy cows using different freestall waste removal techniques. Four cows per treatment (n = 4) were housed in an environmental chamber. Waste was removed by either flushing or scraping at 2 different frequencies. The 4 treatments arranged as a Latin square were (1) flushing 3 times a day (F3), (2) flushing 6 times a day (F6), (3) scraping 3 times a day (S3), and (4) scraping 6 times a day (S6). Gas concentrations were collected at the inlet and outlet air ducts of the environmental chamber and were transported to a mobile agricultural air quality lab. Gas emission rates were calculated and then analyzed using the lmerTest package in R. Ammonia and hydrogen sulfide (H₂S) emissions decreased (P < 0.001 and P < 0.05) in the flushing vs. scraping treatments, respectively. Ethanol emissions increased (P < 0.001) when the frequency of either scraping or flushing was increased from 3 to 6 times, but remained similar between scraping and flushing treatments. Methane emissions for the F3 were lower than all other treatments (P < 0.001). Removal of dairy freestall manure by flushing versus scraping has the potential to decrease gaseous emissions such as NH₃ and CH₄.