AQSQID: 060750005

Site Name: San Francisco

Location: San Francisco, CA

Reporting: True, Located: True

Current AQI: 35.0

San Francisco CA, US: 37.7658, -122.3978

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 26, 2019, 9 a.m. 4.8 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A 45.0 ppb (35) 0.22 ppb (2) N/A 3.0 μg/m3 (12) 35.0
 
March 26, 2019, 8 a.m. 4.5 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A 44.0 ppb (34) 0.23 ppb (3) N/A 2.0 μg/m3 (8) 34.0
 
March 26, 2019, 7 a.m. 4.7 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A N/A 44.0 ppb (34) 0.23 ppb (3) N/A 3.0 μg/m3 (12) 34.0
 
March 26, 2019, 6 a.m. 11.1 ppb (10) 0.3 ppb (0) N/A 11.0 ppb (10) N/A N/A 37.0 ppb (28) 0.31 ppb (3) N/A 3.0 μg/m3 (12) 28.0
 
March 26, 2019, 5 a.m. 11.3 ppb (10) 0.3 ppb (0) N/A 11.0 ppb (10) N/A N/A 39.0 ppb (30) 0.29 ppb (3) N/A 1.0 μg/m3 (4) 30.0
 
March 26, 2019, 4 a.m. 8.7 ppb (8) 0.6 ppb (1) N/A 8.0 ppb (7) N/A N/A 44.0 ppb (34) 0.28 ppb (3) N/A 3.0 μg/m3 (12) 34.0
 
March 26, 2019, 3 a.m. 9.0 ppb (8) 0.3 ppb (0) N/A 9.0 ppb (8) N/A N/A 43.0 ppb (33) 0.29 ppb (3) N/A 2.0 μg/m3 (8) 33.0
 
March 26, 2019, 2 a.m. 8.4 ppb (8) 0.4 ppb (0) N/A 8.0 ppb (7) N/A N/A 44.0 ppb (34) 0.3 ppb (3) N/A 1.0 μg/m3 (4) 34.0
 
March 26, 2019, 1 a.m. 6.1 ppb (6) 0.5 ppb (0) N/A 6.0 ppb (6) N/A N/A 44.0 ppb (34) 0.28 ppb (3) N/A 1.0 μg/m3 (4) 34.0
 
March 26, 2019, midnight 5.8 ppb (5) 0.8 ppb (1) N/A 5.0 ppb (5) N/A N/A 41.0 ppb (32) 0.25 ppb (3) N/A 2.0 μg/m3 (8) 32.0
 
March 25, 2019, 11 p.m. 6.4 ppb (6) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A 36.0 ppb (28) 0.26 ppb (3) N/A 3.0 μg/m3 (12) 28.0
 
March 25, 2019, 10 p.m. 9.0 ppb (8) 1.3 ppb (1) N/A 8.0 ppb (7) N/A N/A 35.0 ppb (27) 0.28 ppb (3) N/A 3.0 μg/m3 (12) 27.0
 
March 25, 2019, 9 p.m. 6.2 ppb (6) 0.8 ppb (1) N/A 5.0 ppb (5) N/A N/A 37.0 ppb (28) 0.25 ppb (3) N/A 4.0 μg/m3 (17) 28.0
 
March 25, 2019, 8 p.m. 7.1 ppb (7) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A 40.0 ppb (31) 0.26 ppb (3) N/A 5.0 μg/m3 (21) 31.0
 
March 25, 2019, 7 p.m. 6.6 ppb (6) 0.9 ppb (1) N/A 6.0 ppb (6) N/A N/A 43.0 ppb (33) 0.24 ppb (3) N/A 6.0 μg/m3 (25) 33.0
 
March 25, 2019, 6 p.m. 5.0 ppb (5) 1.1 ppb (1) N/A 4.0 ppb (4) N/A N/A 48.0 ppb (37) 0.23 ppb (3) N/A 7.0 μg/m3 (29) 37.0
 
March 25, 2019, 5 p.m. 5.7 ppb (5) 1.3 ppb (1) N/A 4.0 ppb (4) N/A N/A 48.0 ppb (37) 0.21 ppb (2) N/A 8.0 μg/m3 (33) 37.0
 
March 25, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
March 25, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
March 25, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 25, 2019, 1 p.m. 24.7 ppb (23) 0.8 ppb (1) N/A 24.0 ppb (22) N/A N/A 22.0 ppb (17) 0.4 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
March 25, 2019, noon 28.6 ppb (26) 1.6 ppb (1) N/A 27.0 ppb (25) N/A N/A 19.0 ppb (15) 0.38 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
March 25, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 25, 2019, 10 a.m. 12.7 ppb (12) 0.1 ppb (0) N/A 13.0 ppb (12) N/A N/A 36.0 ppb (28) 0.28 ppb (3) N/A 6.0 μg/m3 (25) 28.0
 
March 25, 2019, 9 a.m. 9.7 ppb (9) 0.0 ppb (0) N/A 10.0 ppb (9) N/A N/A 43.0 ppb (33) 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 25, 2019, 8 a.m. 5.5 ppb (5) 0.0 ppb (0) N/A 6.0 ppb (6) N/A N/A 47.0 ppb (36) 0.24 ppb (3) N/A 8.0 μg/m3 (33) 36.0
 
March 25, 2019, 7 a.m. 6.2 ppb (6) 0.2 ppb (0) N/A 6.0 ppb (6) N/A N/A 48.0 ppb (37) 0.25 ppb (3) N/A 7.0 μg/m3 (29) 37.0
 
March 25, 2019, 6 a.m. 12.6 ppb (12) 0.3 ppb (0) N/A 12.0 ppb (11) N/A N/A 40.0 ppb (31) 0.31 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 25, 2019, 5 a.m. 20.7 ppb (19) 0.4 ppb (0) N/A 20.0 ppb (19) N/A N/A 31.0 ppb (24) 0.36 ppb (4) N/A 4.0 μg/m3 (17) 24.0
 
March 25, 2019, 4 a.m. 22.4 ppb (21) 0.2 ppb (0) N/A 22.0 ppb (20) N/A N/A 30.0 ppb (23) 0.3 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 25, 2019, 3 a.m. 15.6 ppb (14) 0.1 ppb (0) N/A 16.0 ppb (15) N/A N/A 38.0 ppb (29) 0.35 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
March 25, 2019, 2 a.m. 9.5 ppb (9) 0.1 ppb (0) N/A 9.0 ppb (8) N/A N/A 46.0 ppb (35) 0.3 ppb (3) N/A 6.0 μg/m3 (25) 35.0
 
March 25, 2019, 1 a.m. 5.0 ppb (5) 0.2 ppb (0) N/A 5.0 ppb (5) N/A N/A 52.0 ppb (40) 0.24 ppb (3) N/A 3.0 μg/m3 (12) 40.0
 
March 25, 2019, midnight 3.7 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A 52.0 ppb (40) 0.25 ppb (3) N/A 4.0 μg/m3 (17) 40.0
 
March 24, 2019, 11 p.m. 4.2 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A 53.0 ppb (41) 0.27 ppb (3) N/A 6.0 μg/m3 (25) 41.0
 
March 24, 2019, 10 p.m. 2.7 ppb (3) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 60.0 ppb (46) 0.23 ppb (3) N/A 6.0 μg/m3 (25) 46.0
 
March 24, 2019, 9 p.m. 3.9 ppb (4) 0.5 ppb (0) N/A 3.0 ppb (3) N/A N/A 57.0 ppb (44) 0.24 ppb (3) N/A 7.0 μg/m3 (29) 44.0
 
March 24, 2019, 8 p.m. 4.1 ppb (4) 0.7 ppb (1) N/A 3.0 ppb (3) N/A N/A 55.0 ppb (42) 0.22 ppb (2) N/A 5.0 μg/m3 (21) 42.0
 
March 24, 2019, 7 p.m. 12.9 ppb (12) 3.8 ppb (4) N/A 9.0 ppb (8) N/A N/A 41.0 ppb (32) 0.29 ppb (3) N/A 7.0 μg/m3 (29) 32.0
 
March 24, 2019, 6 p.m. 4.9 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 46.0 ppb (35) 0.28 ppb (3) N/A 4.0 μg/m3 (17) 35.0
 
March 24, 2019, 5 p.m. 5.3 ppb (5) 1.2 ppb (1) N/A 4.0 ppb (4) N/A N/A 43.0 ppb (33) 0.26 ppb (3) N/A 5.0 μg/m3 (21) 33.0
 
March 24, 2019, 4 p.m. 8.4 ppb (8) 2.1 ppb (2) N/A 6.0 ppb (6) N/A N/A 37.0 ppb (28) 0.28 ppb (3) N/A 6.0 μg/m3 (25) 28.0
 
March 24, 2019, 3 p.m. 10.9 ppb (10) 1.8 ppb (2) N/A 9.0 ppb (8) N/A N/A 33.0 ppb (25) 0.31 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 24, 2019, 2 p.m. 14.8 ppb (14) 1.0 ppb (1) N/A 14.0 ppb (13) N/A N/A 23.0 ppb (18) 0.35 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
March 24, 2019, 1 p.m. 18.2 ppb (17) 0.9 ppb (1) N/A 17.0 ppb (16) N/A N/A 19.0 ppb (15) 0.35 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
March 24, 2019, noon 16.6 ppb (15) 2.4 ppb (2) N/A 14.0 ppb (13) N/A N/A 25.0 ppb (19) 0.34 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
March 24, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
March 24, 2019, 10 a.m. 16.1 ppb (15) 0.4 ppb (0) N/A 16.0 ppb (15) N/A N/A 28.0 ppb (22) 0.34 ppb (4) N/A 4.0 μg/m3 (17) 22.0
 
March 24, 2019, 9 a.m. 11.1 ppb (10) 0.6 ppb (1) N/A 11.0 ppb (10) N/A N/A 36.0 ppb (28) 0.31 ppb (3) N/A 6.0 μg/m3 (25) 28.0
 
March 24, 2019, 8 a.m. 12.0 ppb (11) 0.2 ppb (0) N/A 12.0 ppb (11) N/A N/A 35.0 ppb (27) 0.33 ppb (4) N/A 6.0 μg/m3 (25) 27.0
 
March 24, 2019, 7 a.m. 11.2 ppb (10) 0.1 ppb (0) N/A 11.0 ppb (10) N/A N/A 39.0 ppb (30) 0.33 ppb (4) N/A 6.0 μg/m3 (25) 30.0
 
March 24, 2019, 6 a.m. 4.6 ppb (4) 0.1 ppb (0) N/A 5.0 ppb (5) N/A N/A 49.0 ppb (38) 0.29 ppb (3) N/A 5.0 μg/m3 (21) 38.0
 
March 24, 2019, 5 a.m. 5.5 ppb (5) 0.0 ppb (0) N/A 6.0 ppb (6) N/A N/A 48.0 ppb (37) 0.29 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 24, 2019, 4 a.m. 6.2 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A N/A 48.0 ppb (37) 0.28 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
March 24, 2019, 3 a.m. 4.4 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A 51.0 ppb (39) 0.26 ppb (3) N/A 4.0 μg/m3 (17) 39.0
 
March 24, 2019, 2 a.m. 3.6 ppb (3) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A 54.0 ppb (42) 0.24 ppb (3) N/A 5.0 μg/m3 (21) 42.0
 
March 24, 2019, 1 a.m. 3.3 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A 53.0 ppb (41) 0.23 ppb (3) N/A 2.0 μg/m3 (8) 41.0
 
March 24, 2019, midnight 2.7 ppb (3) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 53.0 ppb (41) 0.22 ppb (2) N/A 5.0 μg/m3 (21) 41.0
 
March 23, 2019, 11 p.m. 2.8 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A 53.0 ppb (41) 0.23 ppb (3) N/A 8.0 μg/m3 (33) 41.0
 
March 23, 2019, 10 p.m. 3.2 ppb (3) 0.5 ppb (0) N/A 3.0 ppb (3) N/A N/A 56.0 ppb (43) 0.23 ppb (3) N/A 8.0 μg/m3 (33) 43.0
 
March 23, 2019, 9 p.m. 3.6 ppb (3) 0.7 ppb (1) N/A 3.0 ppb (3) N/A N/A 54.0 ppb (42) 0.23 ppb (3) N/A 7.0 μg/m3 (29) 42.0
 
March 23, 2019, 8 p.m. 4.1 ppb (4) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A 53.0 ppb (41) 0.23 ppb (3) N/A 9.0 μg/m3 (38) 41.0
 
March 23, 2019, 7 p.m. 4.3 ppb (4) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A 51.0 ppb (39) 0.24 ppb (3) N/A 9.0 μg/m3 (38) 39.0
 
March 23, 2019, 6 p.m. 4.1 ppb (4) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A 50.0 ppb (38) 0.25 ppb (3) N/A 6.0 μg/m3 (25) 38.0
 
March 23, 2019, 5 p.m. 5.1 ppb (5) 1.1 ppb (1) N/A 4.0 ppb (4) N/A N/A 49.0 ppb (38) 0.26 ppb (3) N/A 4.0 μg/m3 (17) 38.0
 
March 23, 2019, 4 p.m. 7.4 ppb (7) 1.4 ppb (1) N/A 6.0 ppb (6) N/A N/A 47.0 ppb (36) 0.26 ppb (3) N/A 5.0 μg/m3 (21) 36.0
 
March 23, 2019, 3 p.m. 8.4 ppb (8) 0.9 ppb (1) N/A 8.0 ppb (7) N/A N/A 46.0 ppb (35) 0.27 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 23, 2019, 2 p.m. 12.0 ppb (11) 0.8 ppb (1) N/A 11.0 ppb (10) N/A N/A 42.0 ppb (32) 0.31 ppb (3) N/A 7.0 μg/m3 (29) 32.0
 
March 23, 2019, 1 p.m. 8.3 ppb (8) 0.6 ppb (1) N/A 8.0 ppb (7) N/A N/A 46.0 ppb (35) 0.25 ppb (3) N/A 5.0 μg/m3 (21) 35.0
 
March 23, 2019, noon 8.5 ppb (8) 0.6 ppb (1) N/A 8.0 ppb (7) N/A N/A 45.0 ppb (35) 0.24 ppb (3) N/A 4.0 μg/m3 (17) 35.0
 
March 23, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
March 23, 2019, 10 a.m. 11.9 ppb (11) 0.1 ppb (0) N/A 12.0 ppb (11) N/A N/A 40.0 ppb (31) 0.3 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 23, 2019, 9 a.m. 7.6 ppb (7) 0.8 ppb (1) N/A 7.0 ppb (6) N/A N/A 46.0 ppb (35) 0.28 ppb (3) N/A 5.0 μg/m3 (21) 35.0
 
March 23, 2019, 8 a.m. 6.1 ppb (6) 0.1 ppb (0) N/A 6.0 ppb (6) N/A N/A 44.0 ppb (34) 0.26 ppb (3) N/A 3.0 μg/m3 (12) 34.0
 
March 23, 2019, 7 a.m. 7.8 ppb (7) 0.1 ppb (0) N/A 8.0 ppb (7) N/A N/A 37.0 ppb (28) 0.27 ppb (3) N/A 2.0 μg/m3 (8) 28.0
 
March 23, 2019, 6 a.m. 6.2 ppb (6) 0.1 ppb (0) N/A 6.0 ppb (6) N/A N/A 38.0 ppb (29) 0.27 ppb (3) N/A 3.0 μg/m3 (12) 29.0
 
March 23, 2019, 5 a.m. 5.8 ppb (5) 0.1 ppb (0) N/A 6.0 ppb (6) N/A N/A 38.0 ppb (29) 0.27 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 23, 2019, 4 a.m. 9.4 ppb (9) 0.4 ppb (0) N/A 9.0 ppb (8) N/A N/A 35.0 ppb (27) 0.3 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
March 23, 2019, 3 a.m. 8.4 ppb (8) 0.1 ppb (0) N/A 8.0 ppb (7) N/A N/A 37.0 ppb (28) 0.31 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 23, 2019, 2 a.m. 8.8 ppb (8) 0.2 ppb (0) N/A 9.0 ppb (8) N/A N/A 38.0 ppb (29) 0.3 ppb (3) N/A 6.0 μg/m3 (25) 29.0
 
March 23, 2019, 1 a.m. 7.9 ppb (7) 0.4 ppb (0) N/A 8.0 ppb (7) N/A N/A 40.0 ppb (31) 0.31 ppb (3) N/A 1.0 μg/m3 (4) 31.0
 
March 23, 2019, midnight 7.1 ppb (7) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A 41.0 ppb (32) 0.31 ppb (3) N/A -1.0 μg/m3 (0) 32.0
 
March 22, 2019, 11 p.m. 10.5 ppb (10) 1.0 ppb (1) N/A 10.0 ppb (9) N/A N/A 38.0 ppb (29) 0.31 ppb (3) N/A 1.0 μg/m3 (4) 29.0
 
March 22, 2019, 10 p.m. 12.4 ppb (11) 1.3 ppb (1) N/A 11.0 ppb (10) N/A N/A 37.0 ppb (28) 0.35 ppb (4) N/A 5.0 μg/m3 (21) 28.0
 
March 22, 2019, 9 p.m. 10.5 ppb (10) 1.2 ppb (1) N/A 9.0 ppb (8) N/A N/A 40.0 ppb (31) 0.33 ppb (4) N/A 7.0 μg/m3 (29) 31.0
 
March 22, 2019, 8 p.m. 9.5 ppb (9) 1.4 ppb (1) N/A 8.0 ppb (7) N/A N/A 43.0 ppb (33) 0.29 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 22, 2019, 7 p.m. 11.7 ppb (11) 2.7 ppb (3) N/A 9.0 ppb (8) N/A N/A 41.0 ppb (32) 0.3 ppb (3) N/A 4.0 μg/m3 (17) 32.0
 
March 22, 2019, 6 p.m. 12.4 ppb (11) 2.2 ppb (2) N/A 10.0 ppb (9) N/A N/A 37.0 ppb (28) 0.3 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 22, 2019, 5 p.m. 15.2 ppb (14) 3.0 ppb (3) N/A 12.0 ppb (11) N/A N/A 31.0 ppb (24) 0.33 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
March 22, 2019, 4 p.m. 13.8 ppb (13) 1.4 ppb (1) N/A 12.0 ppb (11) N/A N/A 34.0 ppb (26) 0.3 ppb (3) N/A 3.0 μg/m3 (12) 26.0
 
March 22, 2019, 3 p.m. 17.7 ppb (16) 1.3 ppb (1) N/A 16.0 ppb (15) N/A N/A 30.0 ppb (23) 0.3 ppb (3) N/A 4.0 μg/m3 (17) 23.0
 
March 22, 2019, 2 p.m. 14.8 ppb (14) 0.6 ppb (1) N/A 14.0 ppb (13) N/A N/A 29.0 ppb (22) 0.29 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 22, 2019, 1 p.m. 14.0 ppb (13) 0.3 ppb (0) N/A 14.0 ppb (13) N/A N/A 29.0 ppb (22) 0.37 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
March 22, 2019, noon 11.3 ppb (10) 0.1 ppb (0) N/A 11.0 ppb (10) N/A N/A 36.0 ppb (28) 0.33 ppb (4) N/A 5.0 μg/m3 (21) 28.0
 
March 22, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 22, 2019, 10 a.m. 15.0 ppb (14) 0.0 ppb (0) N/A 15.0 ppb (14) N/A N/A 33.0 ppb (25) 0.28 ppb (3) N/A 2.0 μg/m3 (8) 25.0
 
March 22, 2019, 9 a.m. 10.2 ppb (9) 0.0 ppb (0) N/A 10.0 ppb (9) N/A N/A 36.0 ppb (28) 0.27 ppb (3) N/A 0.0 μg/m3 (0) 28.0
 
March 22, 2019, 8 a.m. 5.7 ppb (5) -0.1 ppb (0) N/A 6.0 ppb (6) N/A N/A 40.0 ppb (31) 0.28 ppb (3) N/A 3.0 μg/m3 (12) 31.0
 
March 22, 2019, 7 a.m. 7.1 ppb (7) 0.0 ppb (0) N/A 7.0 ppb (6) N/A N/A 41.0 ppb (32) 0.28 ppb (3) N/A 6.0 μg/m3 (25) 32.0
 
March 22, 2019, 6 a.m. 7.8 ppb (7) -0.1 ppb (0) N/A 8.0 ppb (7) N/A N/A 42.0 ppb (32) 0.29 ppb (3) N/A 6.0 μg/m3 (25) 32.0
 
March 22, 2019, 5 a.m. 4.2 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A N/A 46.0 ppb (35) 0.28 ppb (3) N/A 4.0 μg/m3 (17) 35.0
 
March 22, 2019, 4 a.m. 4.7 ppb (4) 0.0 ppb (0) N/A 5.0 ppb (5) N/A N/A 46.0 ppb (35) 0.26 ppb (3) N/A 5.0 μg/m3 (21) 35.0
 
March 22, 2019, 3 a.m. 6.5 ppb (6) 0.0 ppb (0) N/A 7.0 ppb (6) N/A N/A 44.0 ppb (34) 0.28 ppb (3) N/A 6.0 μg/m3 (25) 34.0
 
March 22, 2019, 2 a.m. 6.0 ppb (6) 0.3 ppb (0) N/A 6.0 ppb (6) N/A N/A 45.0 ppb (35) 0.27 ppb (3) N/A 7.0 μg/m3 (29) 35.0
 
March 22, 2019, 1 a.m. 5.1 ppb (5) 0.5 ppb (0) N/A 5.0 ppb (5) N/A N/A 46.0 ppb (35) 0.24 ppb (3) N/A 5.0 μg/m3 (21) 35.0
 
March 22, 2019, midnight 3.9 ppb (4) 0.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 48.0 ppb (37) 0.25 ppb (3) N/A 5.0 μg/m3 (21) 37.0
 
March 21, 2019, 11 p.m. 4.5 ppb (4) 0.9 ppb (1) N/A 4.0 ppb (4) N/A N/A 48.0 ppb (37) 0.24 ppb (3) N/A 3.0 μg/m3 (12) 37.0
 
March 21, 2019, 10 p.m. 5.9 ppb (5) 1.4 ppb (1) N/A 5.0 ppb (5) N/A N/A 48.0 ppb (37) 0.25 ppb (3) N/A 5.0 μg/m3 (21) 37.0
 
March 21, 2019, 9 p.m. 5.8 ppb (5) 1.4 ppb (1) N/A 4.0 ppb (4) N/A N/A 49.0 ppb (38) 0.24 ppb (3) N/A 6.0 μg/m3 (25) 38.0
 
March 21, 2019, 8 p.m. 10.7 ppb (10) 2.7 ppb (3) N/A 8.0 ppb (7) N/A N/A 45.0 ppb (35) 0.26 ppb (3) N/A 6.0 μg/m3 (25) 35.0
 
March 21, 2019, 7 p.m. 10.1 ppb (9) 2.4 ppb (2) N/A 8.0 ppb (7) N/A N/A 45.0 ppb (35) 0.25 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 21, 2019, 6 p.m. 7.6 ppb (7) 1.9 ppb (2) N/A 6.0 ppb (6) N/A N/A 46.0 ppb (35) 0.25 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
March 21, 2019, 5 p.m. 13.9 ppb (13) 4.5 ppb (4) N/A 9.0 ppb (8) N/A N/A 37.0 ppb (28) 0.3 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 21, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
March 21, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 21, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
March 21, 2019, noon 23.4 ppb (22) 8.4 ppb (8) N/A 15.0 ppb (14) N/A N/A 24.0 ppb (18) 0.27 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 11 a.m. 15.3 ppb (14) 1.8 ppb (2) N/A 14.0 ppb (13) N/A N/A 25.0 ppb (19) 0.3 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 21, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 9 a.m. 9.3 ppb (9) 0.1 ppb (0) N/A 9.0 ppb (8) N/A N/A 31.0 ppb (24) 0.3 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 21, 2019, 8 a.m. 13.8 ppb (13) 0.2 ppb (0) N/A 14.0 ppb (13) N/A N/A 27.0 ppb (21) 0.32 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
March 21, 2019, 7 a.m. 13.4 ppb (12) 0.2 ppb (0) N/A 13.0 ppb (12) N/A N/A 29.0 ppb (22) 0.33 ppb (4) N/A 5.0 μg/m3 (21) 22.0
 
March 21, 2019, 6 a.m. 12.5 ppb (12) 0.1 ppb (0) N/A 12.0 ppb (11) N/A N/A 33.0 ppb (25) 0.35 ppb (4) N/A 3.0 μg/m3 (12) 25.0
 
March 21, 2019, 5 a.m. 9.8 ppb (9) 0.1 ppb (0) N/A 10.0 ppb (9) N/A N/A 39.0 ppb (30) 0.34 ppb (4) N/A 5.0 μg/m3 (21) 30.0
 
March 21, 2019, 4 a.m. 6.0 ppb (6) 0.1 ppb (0) N/A 6.0 ppb (6) N/A N/A 46.0 ppb (35) 0.26 ppb (3) N/A 8.0 μg/m3 (33) 35.0
 
March 21, 2019, 3 a.m. 5.9 ppb (5) 0.1 ppb (0) N/A 6.0 ppb (6) N/A N/A 46.0 ppb (35) 0.26 ppb (3) N/A 6.0 μg/m3 (25) 35.0
 
March 21, 2019, 2 a.m. 4.5 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A 48.0 ppb (37) 0.23 ppb (3) N/A 5.0 μg/m3 (21) 37.0
 
March 21, 2019, 1 a.m. 5.2 ppb (5) 0.4 ppb (0) N/A 5.0 ppb (5) N/A N/A 48.0 ppb (37) 0.24 ppb (3) N/A 6.0 μg/m3 (25) 37.0
 
March 21, 2019, midnight 4.4 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A 49.0 ppb (38) 0.23 ppb (3) N/A 8.0 μg/m3 (33) 38.0
 
March 20, 2019, 11 p.m. 4.2 ppb (4) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A 52.0 ppb (40) 0.23 ppb (3) N/A 8.0 μg/m3 (33) 40.0
 
March 20, 2019, 10 p.m. 4.2 ppb (4) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A 52.0 ppb (40) 0.21 ppb (2) N/A 8.0 μg/m3 (33) 40.0
 
March 20, 2019, 9 p.m. 5.4 ppb (5) 1.2 ppb (1) N/A 4.0 ppb (4) N/A N/A 51.0 ppb (39) 0.22 ppb (2) N/A 5.0 μg/m3 (21) 39.0
 
March 20, 2019, 8 p.m. 5.5 ppb (5) 1.2 ppb (1) N/A 4.0 ppb (4) N/A N/A 51.0 ppb (39) 0.24 ppb (3) N/A 4.0 μg/m3 (17) 39.0
 
March 20, 2019, 7 p.m. 6.1 ppb (6) 1.4 ppb (1) N/A 5.0 ppb (5) N/A N/A 50.0 ppb (38) 0.24 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 20, 2019, 6 p.m. 7.1 ppb (7) 1.5 ppb (1) N/A 6.0 ppb (6) N/A N/A 49.0 ppb (38) 0.26 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
March 20, 2019, 5 p.m. 7.9 ppb (7) 1.4 ppb (1) N/A 6.0 ppb (6) N/A N/A 50.0 ppb (38) 0.25 ppb (3) N/A 6.0 μg/m3 (25) 38.0
 
March 20, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
March 20, 2019, 3 p.m. 12.3 ppb (11) 1.1 ppb (1) N/A 11.0 ppb (10) N/A N/A 46.0 ppb (35) 0.31 ppb (3) N/A 3.0 μg/m3 (12) 35.0
 
March 20, 2019, 2 p.m. 12.3 ppb (11) 0.5 ppb (0) N/A 12.0 ppb (11) N/A N/A 41.0 ppb (32) 0.25 ppb (3) N/A 4.0 μg/m3 (17) 32.0
 
March 20, 2019, 1 p.m. 8.6 ppb (8) 0.2 ppb (0) N/A 8.0 ppb (7) N/A N/A 44.0 ppb (34) 0.21 ppb (2) N/A 2.0 μg/m3 (8) 34.0
 
March 20, 2019, noon 9.0 ppb (8) 0.2 ppb (0) N/A 9.0 ppb (8) N/A N/A 45.0 ppb (35) 0.21 ppb (2) N/A 2.0 μg/m3 (8) 35.0
 
March 20, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 4.0
 
March 20, 2019, 10 a.m. 2.9 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A 52.0 ppb (40) 0.19 ppb (2) N/A 1.0 μg/m3 (4) 40.0
 
March 20, 2019, 9 a.m. 4.2 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A 51.0 ppb (39) 0.19 ppb (2) N/A 7.0 μg/m3 (29) 39.0
 
March 20, 2019, 8 a.m. 4.3 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A 53.0 ppb (41) 0.19 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
March 20, 2019, 7 a.m. 5.0 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A N/A 53.0 ppb (41) 0.18 ppb (2) N/A -1.0 μg/m3 (0) 41.0
 
March 20, 2019, 6 a.m. 4.0 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A 54.0 ppb (42) 0.17 ppb (2) N/A 1.0 μg/m3 (4) 42.0
 
March 20, 2019, 5 a.m. 5.1 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A N/A 51.0 ppb (39) 0.19 ppb (2) N/A 1.0 μg/m3 (4) 39.0
 
March 20, 2019, 4 a.m. 3.8 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A 49.0 ppb (38) 0.19 ppb (2) N/A 3.0 μg/m3 (12) 38.0
 
March 20, 2019, 3 a.m. 4.7 ppb (4) 0.2 ppb (0) N/A 5.0 ppb (5) N/A N/A 49.0 ppb (38) 0.19 ppb (2) N/A 6.0 μg/m3 (25) 38.0
 
March 20, 2019, 2 a.m. 7.4 ppb (7) 0.2 ppb (0) N/A 7.0 ppb (6) N/A N/A 52.0 ppb (40) 0.2 ppb (2) N/A 7.0 μg/m3 (29) 40.0
 
March 20, 2019, 1 a.m. 5.6 ppb (5) 0.3 ppb (0) N/A 5.0 ppb (5) N/A N/A 51.0 ppb (39) 0.22 ppb (2) N/A 4.0 μg/m3 (17) 39.0
 
March 20, 2019, midnight 11.6 ppb (11) 1.3 ppb (1) N/A 10.0 ppb (9) N/A N/A 43.0 ppb (33) 0.28 ppb (3) N/A 5.0 μg/m3 (21) 33.0
 
March 19, 2019, 11 p.m. 11.5 ppb (11) 1.8 ppb (2) N/A 10.0 ppb (9) N/A N/A 44.0 ppb (34) 0.32 ppb (4) N/A 8.0 μg/m3 (33) 34.0
 
March 19, 2019, 10 p.m. 12.1 ppb (11) 2.1 ppb (2) N/A 10.0 ppb (9) N/A N/A 46.0 ppb (35) 0.3 ppb (3) N/A 8.0 μg/m3 (33) 35.0
 
March 19, 2019, 9 p.m. 13.2 ppb (12) 2.5 ppb (2) N/A 11.0 ppb (10) N/A N/A 45.0 ppb (35) 0.3 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
March 19, 2019, 8 p.m. 13.9 ppb (13) 2.8 ppb (3) N/A 11.0 ppb (10) N/A N/A 45.0 ppb (35) 0.29 ppb (3) N/A 8.0 μg/m3 (33) 35.0
 
March 19, 2019, 7 p.m. 13.5 ppb (12) 2.9 ppb (3) N/A 11.0 ppb (10) N/A N/A 43.0 ppb (33) 0.26 ppb (3) N/A 16.0 μg/m3 (59) 59.0
 
March 19, 2019, 6 p.m. 13.8 ppb (13) 3.4 ppb (3) N/A 10.0 ppb (9) N/A N/A 40.0 ppb (31) 0.27 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
March 19, 2019, 5 p.m. 20.6 ppb (19) 5.9 ppb (5) N/A 15.0 ppb (14) N/A N/A 29.0 ppb (22) 0.33 ppb (4) N/A N/A 22.0
 
March 19, 2019, 4 p.m. 23.4 ppb (22) 6.5 ppb (6) N/A 17.0 ppb (16) N/A N/A 24.0 ppb (18) 0.36 ppb (4) N/A 19.0 μg/m3 (65) 65.0
 
March 19, 2019, 3 p.m. 27.3 ppb (25) 5.9 ppb (5) N/A 21.0 ppb (19) N/A N/A 19.0 ppb (15) 0.41 ppb (5) N/A 18.0 μg/m3 (63) 63.0
 
March 19, 2019, 2 p.m. 35.4 ppb (33) 5.1 ppb (5) N/A 30.0 ppb (28) N/A N/A 12.0 ppb (9) 0.4 ppb (4) N/A 19.0 μg/m3 (65) 65.0
 
March 19, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 15.0 μg/m3 (56) 56.0
 
March 19, 2019, noon 30.0 ppb (28) 2.0 ppb (2) N/A 28.0 ppb (26) N/A N/A 9.0 ppb (7) 0.52 ppb (6) N/A 14.0 μg/m3 (54) 54.0
 
March 19, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 10 a.m. 14.7 ppb (14) 1.7 ppb (2) N/A 13.0 ppb (12) N/A N/A 30.0 ppb (23) 0.38 ppb (4) N/A 10.0 μg/m3 (42) 42.0