AQSQID: 460330132

Site Name: Wind Cave

Location: Custer Co, SD

Reporting: True, Located: True

Current AQI: 38.0

Custer Co SD, US: 43.557613, -103.483658

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 26, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A 15.0 μg/m3 (14) 5.0 μg/m3 (21) 38.0
 
March 26, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 9.0 μg/m3 (8) 2.9 μg/m3 (12) 35.0
 
March 26, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 7.0 μg/m3 (6) 4.3 μg/m3 (18) 35.0
 
March 26, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 12.0 μg/m3 (11) 2.4 μg/m3 (10) 35.0
 
March 26, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 8.0 μg/m3 (7) 0.4 μg/m3 (2) 36.0
 
March 26, 2019, noon N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 1.0 μg/m3 (1) 2.2 μg/m3 (9) 34.0
 
March 26, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 5.0 μg/m3 (5) 2.2 μg/m3 (9) 28.0
 
March 26, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 5.0 μg/m3 (5) 2.9 μg/m3 (12) 25.0
 
March 26, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 3.0 μg/m3 (3) 5.0 μg/m3 (21) 26.0
 
March 26, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (18) N/A 3.0 μg/m3 (3) 2.9 μg/m3 (12) 18.0
 
March 26, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 15.0 ppb (12) N/A 3.0 μg/m3 (3) 1.7 μg/m3 (7) 12.0
 
March 26, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 3.0 μg/m3 (3) 1.9 μg/m3 (8) 13.0
 
March 26, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 0.0 μg/m3 (0) 1.4 μg/m3 (6) 15.0
 
March 26, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A -1.0 μg/m3 (0) 1.2 μg/m3 (5) 15.0
 
March 26, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A -1.0 μg/m3 (0) 2.2 μg/m3 (9) 15.0
 
March 26, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A -2.0 μg/m3 (0) 2.7 μg/m3 (11) 15.0
 
March 26, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 0.0 μg/m3 (0) 4.0 μg/m3 (17) 17.0
 
March 26, 2019, midnight N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 3.0 μg/m3 (3) 4.0 μg/m3 (17) 17.0
 
March 25, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 3.0 μg/m3 (3) 2.7 μg/m3 (11) 14.0
 
March 25, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 4.0 μg/m3 (4) 2.9 μg/m3 (12) 14.0
 
March 25, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 4.0 μg/m3 (4) 5.0 μg/m3 (21) 21.0
 
March 25, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A 6.0 μg/m3 (5) 6.7 μg/m3 (28) 28.0
 
March 25, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (17) N/A 10.0 μg/m3 (9) 7.2 μg/m3 (30) 30.0
 
March 25, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A 13.0 μg/m3 (12) 8.9 μg/m3 (37) 37.0
 
March 25, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 8.0 μg/m3 (7) 6.7 μg/m3 (28) 28.0
 
March 25, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 6.0 μg/m3 (5) 4.5 μg/m3 (19) 19.0
 
March 25, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A 2.0 μg/m3 (2) 5.0 μg/m3 (21) 21.0
 
March 25, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (18) N/A 4.0 μg/m3 (4) 2.9 μg/m3 (12) 18.0
 
March 25, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 6.0 μg/m3 (5) 3.2 μg/m3 (13) 19.0
 
March 25, 2019, noon N/A N/A N/A N/A N/A N/A 26.0 ppb (20) N/A 7.0 μg/m3 (6) 0.2 μg/m3 (1) 20.0
 
March 25, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 3.0 μg/m3 (3) -2.2 μg/m3 (0) 19.0
 
March 25, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (17) N/A 3.0 μg/m3 (3) -0.2 μg/m3 (0) 17.0
 
March 25, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A -2.0 μg/m3 (0) 3.4 μg/m3 (14) 15.0
 
March 25, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (17) N/A 0.0 μg/m3 (0) 3.4 μg/m3 (14) 17.0
 
March 25, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (18) N/A 1.0 μg/m3 (1) 2.4 μg/m3 (10) 18.0
 
March 25, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (23) N/A 2.0 μg/m3 (2) 5.5 μg/m3 (23) 23.0
 
March 25, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 7.0 μg/m3 (6) 6.7 μg/m3 (28) 29.0
 
March 25, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 14.0 μg/m3 (13) 6.2 μg/m3 (26) 29.0
 
March 25, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 9.0 μg/m3 (8) 7.5 μg/m3 (31) 31.0
 
March 25, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 8.0 μg/m3 (7) 11.7 μg/m3 (49) 49.0
 
March 25, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 13.0 μg/m3 (12) 9.9 μg/m3 (41) 41.0
 
March 25, 2019, midnight N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 16.0 μg/m3 (15) 7.2 μg/m3 (30) 30.0
 
March 24, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 14.0 μg/m3 (13) 10.9 μg/m3 (45) 45.0
 
March 24, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 17.0 μg/m3 (15) 9.9 μg/m3 (41) 41.0
 
March 24, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 15.0 μg/m3 (14) 9.2 μg/m3 (38) 38.0
 
March 24, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 10.0 μg/m3 (9) 4.8 μg/m3 (20) 26.0
 
March 24, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 13.0 μg/m3 (12) 7.9 μg/m3 (33) 33.0
 
March 24, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 19.0 μg/m3 (17) 11.2 μg/m3 (47) 47.0
 
March 24, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 10.0 μg/m3 (9) 7.5 μg/m3 (31) 31.0
 
March 24, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A 15.0 μg/m3 (14) 7.7 μg/m3 (32) 32.0
 
March 24, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (23) N/A 8.0 μg/m3 (7) 8.2 μg/m3 (34) 34.0
 
March 24, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A 16.0 μg/m3 (15) 10.9 μg/m3 (45) 45.0
 
March 24, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (18) N/A 14.0 μg/m3 (13) 8.4 μg/m3 (35) 35.0
 
March 24, 2019, noon N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A 13.0 μg/m3 (12) 9.4 μg/m3 (39) 39.0
 
March 24, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 12.0 μg/m3 (11) 10.9 μg/m3 (45) 45.0
 
March 24, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (17) N/A 15.0 μg/m3 (14) 8.7 μg/m3 (36) 36.0
 
March 24, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (18) N/A 9.0 μg/m3 (8) 11.4 μg/m3 (48) 48.0
 
March 24, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (22) N/A 16.0 μg/m3 (15) 8.9 μg/m3 (37) 37.0
 
March 24, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 20.0 μg/m3 (18) 10.4 μg/m3 (43) 43.0
 
March 24, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 11.0 μg/m3 (10) 12.9 μg/m3 (52) 52.0
 
March 24, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 22.0 μg/m3 (20) 10.7 μg/m3 (45) 45.0
 
March 24, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 17.0 μg/m3 (15) 10.2 μg/m3 (42) 42.0
 
March 24, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 15.0 μg/m3 (14) 11.9 μg/m3 (50) 50.0
 
March 24, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 16.0 μg/m3 (15) 15.3 μg/m3 (57) 57.0
 
March 24, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 17.0 μg/m3 (15) 18.3 μg/m3 (63) 63.0
 
March 24, 2019, midnight N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 19.0 μg/m3 (17) 13.4 μg/m3 (53) 53.0
 
March 23, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 22.0 μg/m3 (20) 13.9 μg/m3 (54) 54.0
 
March 23, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 23.0 μg/m3 (21) 12.7 μg/m3 (51) 51.0
 
March 23, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 27.0 μg/m3 (25) 19.8 μg/m3 (67) 67.0
 
March 23, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A 22.0 μg/m3 (20) 17.5 μg/m3 (62) 62.0
 
March 23, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 22.0 μg/m3 (20) 15.4 μg/m3 (57) 57.0
 
March 23, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 15.0 μg/m3 (14) 10.2 μg/m3 (42) 42.0
 
March 23, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 8.0 μg/m3 (7) 2.9 μg/m3 (12) 32.0
 
March 23, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 6.0 μg/m3 (5) 2.9 μg/m3 (12) 31.0
 
March 23, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 7.0 μg/m3 (6) 1.9 μg/m3 (8) 29.0
 
March 23, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 5.0 μg/m3 (5) 3.2 μg/m3 (13) 31.0
 
March 23, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 6.0 μg/m3 (5) 4.5 μg/m3 (19) 32.0
 
March 23, 2019, noon N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 10.0 μg/m3 (9) 7.5 μg/m3 (31) 31.0
 
March 23, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 6.0 μg/m3 (5) 4.3 μg/m3 (18) 29.0
 
March 23, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 3.0 μg/m3 (3) 4.0 μg/m3 (17) 26.0
 
March 23, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 7.0 μg/m3 (6) 5.2 μg/m3 (22) 27.0
 
March 23, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 6.0 μg/m3 (5) 1.9 μg/m3 (8) 28.0
 
March 23, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 6.0 μg/m3 (5) 4.3 μg/m3 (18) 28.0
 
March 23, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 6.0 μg/m3 (5) 5.0 μg/m3 (21) 28.0
 
March 23, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 8.0 μg/m3 (7) 4.3 μg/m3 (18) 28.0
 
March 23, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 7.0 μg/m3 (6) 5.0 μg/m3 (21) 30.0
 
March 23, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 8.0 μg/m3 (7) 5.5 μg/m3 (23) 31.0
 
March 23, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 7.0 μg/m3 (6) 5.2 μg/m3 (22) 32.0
 
March 23, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 8.0 μg/m3 (7) 7.4 μg/m3 (31) 34.0
 
March 23, 2019, midnight N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 8.0 μg/m3 (7) 7.2 μg/m3 (30) 36.0
 
March 22, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 10.0 μg/m3 (9) 4.0 μg/m3 (17) 31.0
 
March 22, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 8.0 μg/m3 (7) 2.2 μg/m3 (9) 27.0
 
March 22, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 8.0 μg/m3 (7) 2.9 μg/m3 (12) 28.0
 
March 22, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 9.0 μg/m3 (8) 4.5 μg/m3 (19) 29.0
 
March 22, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 8.0 μg/m3 (7) 3.1 μg/m3 (13) 32.0
 
March 22, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 7.0 μg/m3 (6) 2.2 μg/m3 (9) 29.0
 
March 22, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 6.0 μg/m3 (5) 2.9 μg/m3 (12) 28.0
 
March 22, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A N/A N/A 6.0 μg/m3 (5) 2.7 μg/m3 (11) 11.0
 
March 22, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 6.0 μg/m3 (5) -0.9 μg/m3 (0) 30.0
 
March 22, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 4.0 μg/m3 (4) 0.5 μg/m3 (2) 28.0
 
March 22, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 4.0 μg/m3 (4) 2.4 μg/m3 (10) 26.0
 
March 22, 2019, noon N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 4.0 μg/m3 (4) 2.7 μg/m3 (11) 28.0
 
March 22, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 2.0 μg/m3 (2) 0.5 μg/m3 (2) 29.0
 
March 22, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 3.0 μg/m3 (3) 0.7 μg/m3 (3) 30.0
 
March 22, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 5.0 μg/m3 (5) 2.9 μg/m3 (12) 32.0
 
March 22, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 7.0 μg/m3 (6) 3.8 μg/m3 (16) 34.0
 
March 22, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A 4.0 μg/m3 (4) 3.2 μg/m3 (13) 33.0
 
March 22, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 2.0 μg/m3 (2) 2.4 μg/m3 (10) 34.0
 
March 22, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 3.0 μg/m3 (3) 2.2 μg/m3 (9) 35.0
 
March 22, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 5.0 μg/m3 (5) 2.9 μg/m3 (12) 35.0
 
March 22, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 5.0 μg/m3 (5) 1.9 μg/m3 (8) 35.0
 
March 22, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 4.0 μg/m3 (4) 1.7 μg/m3 (7) 36.0
 
March 22, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A 4.0 μg/m3 (4) 2.7 μg/m3 (11) 38.0
 
March 22, 2019, midnight N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A 5.0 μg/m3 (5) 1.2 μg/m3 (5) 38.0
 
March 21, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A 2.0 μg/m3 (2) 0.0 μg/m3 (0) 38.0
 
March 21, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A -3.0 μg/m3 (0) -2.2 μg/m3 (0) 38.0
 
March 21, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A 0.0 μg/m3 (0) -0.2 μg/m3 (0) 39.0
 
March 21, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A 4.0 μg/m3 (4) 1.9 μg/m3 (8) 38.0
 
March 21, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A 7.0 μg/m3 (6) 0.7 μg/m3 (3) 38.0
 
March 21, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 5.0 μg/m3 (5) 1.9 μg/m3 (8) 36.0
 
March 21, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 2.0 μg/m3 (2) 4.3 μg/m3 (18) 35.0
 
March 21, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 4.0 μg/m3 (4) -0.7 μg/m3 (0) 35.0
 
March 21, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 5.0 μg/m3 (5) -2.2 μg/m3 (0) 35.0
 
March 21, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 5.0 μg/m3 (5) 0.0 μg/m3 (0) 27.0
 
March 21, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 5.0 μg/m3 (5) 2.2 μg/m3 (9) 32.0
 
March 21, 2019, noon N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 2.0 μg/m3 (2) 1.7 μg/m3 (7) 34.0
 
March 21, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 2.0 μg/m3 (2) 1.0 μg/m3 (4) 32.0
 
March 21, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 2.0 μg/m3 (2) 1.7 μg/m3 (7) 32.0
 
March 21, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 5.0 μg/m3 (5) 1.9 μg/m3 (8) 32.0
 
March 21, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 9.0 μg/m3 (8) 2.2 μg/m3 (9) 37.0
 
March 21, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 8.0 μg/m3 (7) 2.9 μg/m3 (12) 37.0
 
March 21, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A 9.0 μg/m3 (8) 4.8 μg/m3 (20) 39.0
 
March 21, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A 4.0 μg/m3 (4) 6.8 μg/m3 (28) 40.0
 
March 21, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A 3.0 μg/m3 (3) 6.3 μg/m3 (26) 38.0
 
March 21, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A 4.0 μg/m3 (4) 1.9 μg/m3 (8) 38.0
 
March 21, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A 3.0 μg/m3 (3) 1.9 μg/m3 (8) 39.0
 
March 21, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A 4.0 μg/m3 (4) 1.7 μg/m3 (7) 38.0
 
March 21, 2019, midnight N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A 6.0 μg/m3 (5) 3.5 μg/m3 (15) 39.0
 
March 20, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A 7.0 μg/m3 (6) 2.8 μg/m3 (12) 40.0
 
March 20, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A 7.0 μg/m3 (6) 2.2 μg/m3 (9) 39.0
 
March 20, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A 6.0 μg/m3 (5) 0.9 μg/m3 (4) 42.0
 
March 20, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A 6.0 μg/m3 (5) 2.0 μg/m3 (8) 42.0
 
March 20, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A 8.0 μg/m3 (7) 3.1 μg/m3 (13) 40.0
 
March 20, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A 3.0 μg/m3 (3) 0.7 μg/m3 (3) 38.0
 
March 20, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 3.0 μg/m3 (3) 1.9 μg/m3 (8) 37.0
 
March 20, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 2.0 μg/m3 (2) 2.7 μg/m3 (11) 34.0
 
March 20, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 5.0 μg/m3 (5) -0.2 μg/m3 (0) 36.0
 
March 20, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 6.0 μg/m3 (5) 1.2 μg/m3 (5) 34.0
 
March 20, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 2.0 μg/m3 (2) 2.7 μg/m3 (11) 35.0
 
March 20, 2019, noon N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A -4.0 μg/m3 (0) 2.4 μg/m3 (10) 36.0
 
March 20, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A -3.0 μg/m3 (0) -0.2 μg/m3 (0) 36.0
 
March 20, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A 2.0 μg/m3 (2) 0.9 μg/m3 (4) 39.0
 
March 20, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A 4.0 μg/m3 (4) 3.6 μg/m3 (15) 42.0
 
March 20, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A 3.0 μg/m3 (3) 6.0 μg/m3 (25) 39.0
 
March 20, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A 0.0 μg/m3 (0) 6.0 μg/m3 (25) 39.0
 
March 20, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 1.0 μg/m3 (1) 4.8 μg/m3 (20) 37.0
 
March 20, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 3.0 μg/m3 (3) 5.0 μg/m3 (21) 32.0
 
March 20, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 5.0 μg/m3 (5) 7.0 μg/m3 (29) 35.0
 
March 20, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 0.0 μg/m3 (0) 5.5 μg/m3 (23) 34.0
 
March 20, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 1.0 μg/m3 (1) 4.3 μg/m3 (18) 35.0
 
March 20, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 4.0 μg/m3 (4) 1.4 μg/m3 (6) 35.0
 
March 20, 2019, midnight N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 8.0 μg/m3 (7) 4.8 μg/m3 (20) 34.0
 
March 19, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 9.0 μg/m3 (8) 5.5 μg/m3 (23) 37.0
 
March 19, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A 9.0 μg/m3 (8) 2.2 μg/m3 (9) 38.0
 
March 19, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 8.0 μg/m3 (7) 4.0 μg/m3 (17) 37.0
 
March 19, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A 7.0 μg/m3 (6) 5.0 μg/m3 (21) 38.0
 
March 19, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 7.0 μg/m3 (6) 2.7 μg/m3 (11) 37.0
 
March 19, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 6.0 μg/m3 (5) 2.2 μg/m3 (9) 37.0