AQSQID: 440070030

Site Name: Near Road

Location: Providence (Downtown), RI

Reporting: True, Located: True

Current AQI: 25.0

Providence (Downtown) RI, US: 41.829495, -71.417457

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 28, 2020, 2 p.m. 31.5 ppb (29) 20.0 ppb (19) N/A 12.0 ppb (11) N/A N/A N/A 0.42 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
March 28, 2020, 1 p.m. 23.6 ppb (22) 10.8 ppb (10) N/A 13.0 ppb (12) N/A N/A N/A 0.33 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
March 28, 2020, noon 47.6 ppb (44) 25.0 ppb (23) N/A 23.0 ppb (21) N/A N/A N/A 0.53 ppb (6) N/A 12.0 μg/m3 (50) 50.0
 
March 28, 2020, 11 a.m. 118.8 ppb (103) 82.9 ppb (81) N/A 36.0 ppb (33) N/A N/A N/A 0.98 ppb (11) N/A 6.0 μg/m3 (25) 81.0
 
March 28, 2020, 10 a.m. 103.2 ppb (100) 75.1 ppb (72) N/A 28.0 ppb (26) N/A N/A N/A 0.93 ppb (10) N/A 7.0 μg/m3 (29) 72.0
 
March 28, 2020, 9 a.m. 68.7 ppb (66) 38.4 ppb (36) N/A 30.0 ppb (28) N/A N/A N/A 0.56 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
March 28, 2020, 8 a.m. 82.2 ppb (80) 50.1 ppb (46) N/A 32.0 ppb (30) N/A N/A N/A 0.64 ppb (7) N/A 8.0 μg/m3 (33) 46.0
 
March 28, 2020, 7 a.m. 60.3 ppb (57) 27.0 ppb (25) N/A 33.0 ppb (31) N/A N/A N/A 0.53 ppb (6) N/A 5.0 μg/m3 (21) 31.0
 
March 28, 2020, 6 a.m. 65.8 ppb (63) 31.6 ppb (29) N/A 34.0 ppb (31) N/A N/A N/A 0.71 ppb (8) N/A 10.0 μg/m3 (42) 42.0
 
March 28, 2020, 5 a.m. 76.9 ppb (74) 40.1 ppb (37) N/A 37.0 ppb (34) N/A N/A N/A 1.0 ppb (11) N/A 11.0 μg/m3 (46) 46.0
 
March 28, 2020, 3 a.m. 29.2 ppb (27) 9.2 ppb (9) N/A 20.0 ppb (19) N/A N/A N/A 0.36 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
March 28, 2020, 2 a.m. 58.6 ppb (55) 23.2 ppb (21) N/A 35.0 ppb (32) N/A N/A N/A 0.81 ppb (9) N/A 8.0 μg/m3 (33) 33.0
 
March 28, 2020, 1 a.m. 49.8 ppb (46) 20.7 ppb (19) N/A 29.0 ppb (27) N/A N/A N/A 0.71 ppb (8) N/A 7.0 μg/m3 (29) 29.0
 
March 28, 2020, midnight 37780.0 ppb (9455) 16.0 ppb (15) N/A 22.0 ppb (20) N/A N/A N/A 0.54 ppb (6) N/A 5.9 μg/m3 (25) 25.0
 
March 27, 2020, 11 p.m. 53220.0 ppb (13325) 29.1 ppb (27) N/A 24.0 ppb (22) N/A N/A N/A 0.66 ppb (7) N/A 4.0 μg/m3 (17) 27.0
 
March 27, 2020, 10 p.m. 38.6 ppb (36) 21.3 ppb (20) N/A 17.0 ppb (16) N/A N/A N/A 0.58 ppb (6) N/A 3.0 μg/m3 (12) 20.0
 
March 27, 2020, 9 p.m. 34.0 ppb (31) 20.4 ppb (19) N/A 14.0 ppb (13) N/A N/A N/A 0.5 ppb (6) N/A 2.0 μg/m3 (8) 19.0
 
March 27, 2020, 8 p.m. N/A N/A N/A N/A N/A N/A N/A 0.52 ppb (6) N/A 6.0 μg/m3 (25) 25.0
 
March 27, 2020, 7 p.m. 39.5 ppb (37) 23.3 ppb (22) N/A 16.0 ppb (15) N/A N/A N/A 0.51 ppb (6) N/A 6.0 μg/m3 (25) 25.0
 
March 27, 2020, 6 p.m. 40.9 ppb (38) 27.1 ppb (25) N/A 14.0 ppb (13) N/A N/A N/A 0.44 ppb (5) N/A 1.0 μg/m3 (4) 25.0
 
March 27, 2020, 5 p.m. 39.2 ppb (36) 24.9 ppb (23) N/A 14.0 ppb (13) N/A N/A N/A 0.38 ppb (4) N/A 1.0 μg/m3 (4) 23.0
 
March 27, 2020, 4 p.m. 46.8 ppb (43) 30.6 ppb (28) N/A 16.0 ppb (15) N/A N/A N/A 0.47 ppb (5) N/A 4.0 μg/m3 (17) 28.0
 
March 27, 2020, 3 p.m. 49.4 ppb (46) 34.6 ppb (32) N/A 15.0 ppb (14) N/A N/A N/A 0.45 ppb (5) N/A 7.0 μg/m3 (29) 32.0
 
March 27, 2020, 2 p.m. 49.3 ppb (46) 33.2 ppb (31) N/A 16.0 ppb (15) N/A N/A N/A 0.39 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
March 27, 2020, 1 p.m. 68.5 ppb (65) 46.6 ppb (43) N/A 22.0 ppb (20) N/A N/A N/A 0.59 ppb (7) N/A 16.0 μg/m3 (59) 59.0
 
March 27, 2020, noon 86.0 ppb (84) 53.8 ppb (50) N/A 32.0 ppb (30) N/A N/A N/A 0.6 ppb (7) N/A 11.0 μg/m3 (46) 50.0
 
March 27, 2020, 11 a.m. 91.3 ppb (90) 56.6 ppb (53) N/A 35.0 ppb (32) N/A N/A N/A 0.67 ppb (7) N/A 12.0 μg/m3 (50) 53.0
 
March 27, 2020, 10 a.m. 59.6 ppb (56) 32.3 ppb (30) N/A 27.0 ppb (25) N/A N/A N/A 0.48 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
March 27, 2020, 9 a.m. 36.1 ppb (33) 17.8 ppb (16) N/A 18.0 ppb (17) N/A N/A N/A 0.34 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
March 27, 2020, 8 a.m. 17230.0 ppb (4305) 8.3 ppb (8) N/A 9.0 ppb (8) N/A N/A N/A 0.29 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 27, 2020, 7 a.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 27, 2020, 6 a.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 27, 2020, 5 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 6.9 μg/m3 (29) 29.0
 
March 27, 2020, 3 a.m. 34.7 ppb (32) 14.3 ppb (13) N/A 21.0 ppb (19) N/A N/A N/A 0.43 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
March 27, 2020, 2 a.m. 27.2 ppb (25) 9.3 ppb (9) N/A 18.0 ppb (17) N/A N/A N/A 0.45 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
March 27, 2020, 1 a.m. 25.6 ppb (24) 9.8 ppb (9) N/A 16.0 ppb (15) N/A N/A N/A 0.47 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
March 27, 2020, midnight 21330.0 ppb (5332) 8.7 ppb (8) N/A 13.0 ppb (12) N/A N/A N/A 0.38 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
March 26, 2020, 11 p.m. 24800.0 ppb (6202) 11.6 ppb (11) N/A 13.0 ppb (12) N/A N/A N/A 0.42 ppb (5) N/A 10.9 μg/m3 (45) 45.0
 
March 26, 2020, 10 p.m. 20300.0 ppb (5074) 8.4 ppb (8) N/A 12.0 ppb (11) N/A N/A N/A 0.35 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 26, 2020, 9 p.m. 37310.0 ppb (9337) 17.7 ppb (16) N/A 20.0 ppb (19) N/A N/A N/A 0.49 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
March 26, 2020, 8 p.m. 32.0 ppb (30) 14.7 ppb (14) N/A 17.0 ppb (16) N/A N/A N/A 0.43 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
March 26, 2020, 7 p.m. 50.2 ppb (46) 31.8 ppb (29) N/A 18.0 ppb (17) N/A N/A N/A 0.6 ppb (7) N/A 6.0 μg/m3 (25) 29.0
 
March 26, 2020, 6 p.m. 37.7 ppb (35) 23.1 ppb (21) N/A 15.0 ppb (14) N/A N/A N/A 0.45 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
March 26, 2020, 5 p.m. 46.5 ppb (43) 34.7 ppb (32) N/A 12.0 ppb (11) N/A N/A N/A 0.43 ppb (5) N/A 6.0 μg/m3 (25) 32.0
 
March 26, 2020, 4 p.m. 38.9 ppb (36) 26.6 ppb (25) N/A 12.0 ppb (11) N/A N/A N/A 0.35 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
March 26, 2020, 3 p.m. 35.5 ppb (33) 25.1 ppb (23) N/A 10.0 ppb (9) N/A N/A N/A 0.31 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 26, 2020, 2 p.m. 45.5 ppb (42) 29.1 ppb (27) N/A 16.0 ppb (15) N/A N/A N/A 0.34 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
March 26, 2020, 1 p.m. 36140.0 ppb (9044) 23.3 ppb (22) N/A 13.0 ppb (12) N/A N/A N/A 0.31 ppb (3) N/A 10.9 μg/m3 (45) 45.0
 
March 26, 2020, noon 60.5 ppb (57) 39.9 ppb (37) N/A 21.0 ppb (19) N/A N/A N/A 0.43 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
March 26, 2020, 11 a.m. 77.6 ppb (75) 53.2 ppb (49) N/A 24.0 ppb (22) N/A N/A N/A 0.58 ppb (6) N/A 9.0 μg/m3 (38) 49.0
 
March 26, 2020, 10 a.m. 42660.0 ppb (10678) 22.1 ppb (20) N/A 21.0 ppb (19) N/A N/A N/A 0.39 ppb (4) N/A 10.9 μg/m3 (45) 45.0
 
March 26, 2020, 9 a.m. 58700.0 ppb (14698) 34.7 ppb (32) N/A 24.0 ppb (22) N/A N/A N/A 0.43 ppb (5) N/A 4.0 μg/m3 (17) 32.0
 
March 26, 2020, 8 a.m. 34.3 ppb (32) 18.2 ppb (17) N/A 16.0 ppb (15) N/A N/A N/A 0.32 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 26, 2020, 7 a.m. 16.8 ppb (16) 5.8 ppb (5) N/A 11.0 ppb (10) N/A N/A N/A 0.25 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
March 26, 2020, 6 a.m. 26.3 ppb (24) 9.8 ppb (9) N/A 17.0 ppb (16) N/A N/A N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 26, 2020, 5 a.m. 16690.0 ppb (4169) 6.3 ppb (6) N/A 10.0 ppb (9) N/A N/A N/A 0.22 ppb (2) N/A 6.9 μg/m3 (29) 29.0
 
March 26, 2020, 3 a.m. 12.1 ppb (11) 3.1 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 26, 2020, 2 a.m. 5.8 ppb (5) 1.3 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 26, 2020, 1 a.m. 6.2 ppb (6) 1.7 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.22 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 26, 2020, midnight 6280.0 ppb (1560) 2.1 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.22 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 25, 2020, 11 p.m. 5960.0 ppb (1480) 1.9 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.2 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 25, 2020, 10 p.m. 7080.0 ppb (1761) 4.4 ppb (4) N/A 3.0 ppb (3) N/A N/A N/A 0.21 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 25, 2020, 9 p.m. 7740.0 ppb (1926) 3.8 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.21 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 25, 2020, 8 p.m. 12.5 ppb (12) 5.9 ppb (5) N/A 7.0 ppb (6) N/A N/A N/A 0.27 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 25, 2020, 7 p.m. 17.3 ppb (16) 9.0 ppb (8) N/A 8.0 ppb (7) N/A N/A N/A 0.28 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 25, 2020, 6 p.m. 28.8 ppb (27) 13.6 ppb (13) N/A 15.0 ppb (14) N/A N/A N/A 0.32 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 25, 2020, 5 p.m. 29.8 ppb (28) 11.8 ppb (11) N/A 18.0 ppb (17) N/A N/A N/A 0.3 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 25, 2020, 4 p.m. 22.6 ppb (21) 12.9 ppb (12) N/A 10.0 ppb (9) N/A N/A N/A 0.27 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 25, 2020, 3 p.m. 23.1 ppb (21) 11.5 ppb (11) N/A 12.0 ppb (11) N/A N/A N/A 0.29 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
March 25, 2020, 2 p.m. 21.0 ppb (19) 7.5 ppb (7) N/A 14.0 ppb (13) N/A N/A N/A 0.25 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
March 25, 2020, 1 p.m. 23.1 ppb (21) 14.1 ppb (13) N/A 9.0 ppb (8) N/A N/A N/A 0.26 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 25, 2020, noon 18.8 ppb (17) 8.4 ppb (8) N/A 10.0 ppb (9) N/A N/A N/A 0.24 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 25, 2020, 11 a.m. 13.8 ppb (13) 5.9 ppb (5) N/A 8.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 25, 2020, 10 a.m. 18.4 ppb (17) 4.4 ppb (4) N/A 14.0 ppb (13) N/A N/A N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 25, 2020, 9 a.m. 39.6 ppb (37) 14.7 ppb (14) N/A 25.0 ppb (23) N/A N/A N/A 0.37 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
March 25, 2020, 8 a.m. 49.0 ppb (45) 23.0 ppb (21) N/A 26.0 ppb (24) N/A N/A N/A 0.35 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
March 25, 2020, 7 a.m. 27660.0 ppb (6919) 12.1 ppb (11) N/A 16.0 ppb (15) N/A N/A N/A 0.28 ppb (3) N/A 6.9 μg/m3 (29) 29.0
 
March 25, 2020, 6 a.m. 30480.0 ppb (7626) 12.8 ppb (12) N/A 18.0 ppb (17) N/A N/A N/A 0.28 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 25, 2020, 5 a.m. 26240.0 ppb (6563) 11.8 ppb (11) N/A 14.0 ppb (13) N/A N/A N/A 0.3 ppb (3) N/A 6.9 μg/m3 (29) 29.0
 
March 25, 2020, 3 a.m. 40.6 ppb (38) 19.0 ppb (18) N/A 22.0 ppb (20) N/A N/A N/A 0.52 ppb (6) N/A 7.0 μg/m3 (29) 29.0
 
March 25, 2020, 2 a.m. 51.3 ppb (48) 25.1 ppb (23) N/A 26.0 ppb (24) N/A N/A N/A 0.9 ppb (10) N/A 5.0 μg/m3 (21) 24.0
 
March 25, 2020, 1 a.m. 43.3 ppb (40) 20.2 ppb (19) N/A 23.0 ppb (21) N/A N/A N/A 0.64 ppb (7) N/A 5.0 μg/m3 (21) 21.0
 
March 25, 2020, midnight 35940.0 ppb (8994) 19.2 ppb (18) N/A 17.0 ppb (16) N/A N/A N/A 0.57 ppb (6) N/A 4.9 μg/m3 (20) 20.0
 
March 24, 2020, 11 p.m. 36960.0 ppb (9250) 19.8 ppb (18) N/A 17.0 ppb (16) N/A N/A N/A 0.47 ppb (5) N/A 4.0 μg/m3 (17) 18.0
 
March 24, 2020, 10 p.m. 37050.0 ppb (9272) 23.2 ppb (21) N/A 14.0 ppb (13) N/A N/A N/A 0.51 ppb (6) N/A 4.0 μg/m3 (17) 21.0
 
March 24, 2020, 9 p.m. 50520.0 ppb (12648) 34.8 ppb (32) N/A 16.0 ppb (15) N/A N/A N/A 0.66 ppb (7) N/A 5.0 μg/m3 (21) 32.0
 
March 24, 2020, 8 p.m. 48.9 ppb (45) 31.7 ppb (29) N/A 17.0 ppb (16) N/A N/A N/A 0.57 ppb (6) N/A 5.0 μg/m3 (21) 29.0
 
March 24, 2020, 7 p.m. 60.1 ppb (56) 35.3 ppb (33) N/A 25.0 ppb (23) N/A N/A N/A 0.59 ppb (7) N/A 3.0 μg/m3 (12) 33.0
 
March 24, 2020, 6 p.m. 49.2 ppb (46) 32.1 ppb (30) N/A 17.0 ppb (16) N/A N/A N/A 0.47 ppb (5) N/A 4.0 μg/m3 (17) 30.0
 
March 24, 2020, 5 p.m. 52.5 ppb (49) 34.8 ppb (32) N/A 18.0 ppb (17) N/A N/A N/A 0.42 ppb (5) N/A 5.0 μg/m3 (21) 32.0
 
March 24, 2020, 4 p.m. 48.6 ppb (45) 33.7 ppb (31) N/A 15.0 ppb (14) N/A N/A N/A 0.47 ppb (5) N/A 5.0 μg/m3 (21) 31.0
 
March 24, 2020, 3 p.m. 45.8 ppb (42) 30.3 ppb (28) N/A 16.0 ppb (15) N/A N/A N/A 0.39 ppb (4) N/A 6.0 μg/m3 (25) 28.0
 
March 24, 2020, 2 p.m. 47.2 ppb (44) 33.3 ppb (31) N/A 14.0 ppb (13) N/A N/A N/A 0.39 ppb (4) N/A 5.0 μg/m3 (21) 31.0
 
March 24, 2020, 1 p.m. 57.8 ppb (54) 40.3 ppb (37) N/A 18.0 ppb (17) N/A N/A N/A 0.43 ppb (5) N/A 3.0 μg/m3 (12) 37.0
 
March 24, 2020, noon 67.2 ppb (64) 45.9 ppb (42) N/A 21.0 ppb (19) N/A N/A N/A 0.52 ppb (6) N/A 6.0 μg/m3 (25) 42.0
 
March 24, 2020, 11 a.m. 64.5 ppb (61) 46.8 ppb (43) N/A 18.0 ppb (17) N/A N/A N/A 0.48 ppb (5) N/A 8.0 μg/m3 (33) 43.0
 
March 24, 2020, 10 a.m. 62.3 ppb (59) 43.0 ppb (40) N/A 19.0 ppb (18) N/A N/A N/A 0.5 ppb (6) N/A 4.0 μg/m3 (17) 40.0
 
March 24, 2020, 9 a.m. 48.9 ppb (45) 31.2 ppb (29) N/A 18.0 ppb (17) N/A N/A N/A 0.36 ppb (4) N/A 3.0 μg/m3 (12) 29.0
 
March 24, 2020, 8 a.m. 23.4 ppb (22) 16.3 ppb (15) N/A 7.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A 1.0 μg/m3 (4) 15.0
 
March 24, 2020, 7 a.m. 13.9 ppb (13) 6.9 ppb (6) N/A 7.0 ppb (6) N/A N/A N/A 0.2 ppb (2) N/A 0.0 μg/m3 (0) 6.0
 
March 24, 2020, 6 a.m. 15180.0 ppb (3791) 7.7 ppb (7) N/A 8.0 ppb (7) N/A N/A N/A 0.21 ppb (2) N/A 0.0 μg/m3 (0) 7.0
 
March 24, 2020, 5 a.m. 12490.0 ppb (3117) 6.7 ppb (6) N/A 6.0 ppb (6) N/A N/A N/A 0.19 ppb (2) N/A 1.0 μg/m3 (4) 6.0
 
March 24, 2020, 3 a.m. 13.4 ppb (12) 5.9 ppb (5) N/A 8.0 ppb (7) N/A N/A N/A 0.25 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
March 24, 2020, 2 a.m. 15.3 ppb (14) 6.1 ppb (6) N/A 9.0 ppb (8) N/A N/A N/A 0.27 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
March 24, 2020, 1 a.m. 32.8 ppb (30) 10.9 ppb (10) N/A 22.0 ppb (20) N/A N/A N/A 0.37 ppb (4) N/A 2.0 μg/m3 (8) 20.0
 
March 24, 2020, midnight 30830.0 ppb (7713) 8.1 ppb (8) N/A 23.0 ppb (21) N/A N/A N/A 0.35 ppb (4) N/A 2.0 μg/m3 (8) 21.0
 
March 23, 2020, 11 p.m. 17090.0 ppb (4270) 7.3 ppb (7) N/A 10.0 ppb (9) N/A N/A N/A 0.28 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 23, 2020, 10 p.m. 21460.0 ppb (5365) 9.5 ppb (9) N/A 12.0 ppb (11) N/A N/A N/A 0.3 ppb (3) N/A 4.9 μg/m3 (20) 20.0
 
March 23, 2020, 9 p.m. 22540.0 ppb (5636) 10.3 ppb (10) N/A 12.0 ppb (11) N/A N/A N/A 0.31 ppb (3) N/A 1.0 μg/m3 (4) 11.0
 
March 23, 2020, 8 p.m. 16.2 ppb (15) 6.0 ppb (6) N/A 10.0 ppb (9) N/A N/A N/A 0.27 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 23, 2020, 7 p.m. 32.3 ppb (30) 15.3 ppb (14) N/A 17.0 ppb (16) N/A N/A N/A 0.37 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
March 23, 2020, 6 p.m. 28.0 ppb (26) 12.2 ppb (11) N/A 16.0 ppb (15) N/A N/A N/A 0.33 ppb (4) N/A 3.0 μg/m3 (12) 15.0
 
March 23, 2020, 5 p.m. 21.5 ppb (20) 13.4 ppb (12) N/A 8.0 ppb (7) N/A N/A N/A 0.26 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 23, 2020, 4 p.m. 26.9 ppb (25) 13.3 ppb (12) N/A 14.0 ppb (13) N/A N/A N/A 0.3 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 23, 2020, 3 p.m. 26.2 ppb (24) 12.4 ppb (11) N/A 14.0 ppb (13) N/A N/A N/A 0.26 ppb (3) N/A 3.0 μg/m3 (12) 13.0
 
March 23, 2020, 2 p.m. 33.5 ppb (31) 19.5 ppb (18) N/A 14.0 ppb (13) N/A N/A N/A 0.28 ppb (3) N/A 2.0 μg/m3 (8) 18.0
 
March 23, 2020, 1 p.m. 33.6 ppb (31) 16.3 ppb (15) N/A 17.0 ppb (16) N/A N/A N/A 0.24 ppb (3) N/A 1.0 μg/m3 (4) 16.0
 
March 23, 2020, noon 24.4 ppb (23) 10.8 ppb (10) N/A 14.0 ppb (13) N/A N/A N/A 0.22 ppb (2) N/A 1.0 μg/m3 (4) 13.0
 
March 23, 2020, 11 a.m. 28.0 ppb (26) 11.6 ppb (11) N/A 16.0 ppb (15) N/A N/A N/A 0.24 ppb (3) N/A 2.0 μg/m3 (8) 15.0
 
March 23, 2020, 10 a.m. 29.6 ppb (27) 13.4 ppb (12) N/A 16.0 ppb (15) N/A N/A N/A 0.28 ppb (3) N/A 3.0 μg/m3 (12) 15.0
 
March 23, 2020, 9 a.m. 18.9 ppb (18) 7.6 ppb (7) N/A 11.0 ppb (10) N/A N/A N/A 0.22 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 23, 2020, 8 a.m. 17.2 ppb (16) 4.3 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A 0.21 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 23, 2020, 7 a.m. 19.1 ppb (18) 8.8 ppb (8) N/A 10.0 ppb (9) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 23, 2020, 6 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 23, 2020, 5 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 23, 2020, 3 a.m. 13.7 ppb (13) 2.3 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.26 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 23, 2020, 2 a.m. 10.0 ppb (9) 1.8 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.21 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 23, 2020, 1 a.m. 12.1 ppb (11) 3.7 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
March 23, 2020, midnight 13250.0 ppb (3307) 3.5 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.21 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2020, 11 p.m. 10390.0 ppb (2590) 2.7 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 22, 2020, 10 p.m. 8930.0 ppb (2225) 2.0 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A 9.9 μg/m3 (41) 41.0
 
March 22, 2020, 9 p.m. 9610.0 ppb (2395) 3.8 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.23 ppb (3) N/A 6.9 μg/m3 (29) 29.0
 
March 22, 2020, 8 p.m. 14.2 ppb (13) 7.3 ppb (7) N/A 7.0 ppb (6) N/A N/A N/A 0.26 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
March 22, 2020, 7 p.m. 9.1 ppb (8) 4.4 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.22 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 22, 2020, 6 p.m. 13.7 ppb (13) 8.1 ppb (8) N/A 6.0 ppb (6) N/A N/A N/A 0.27 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
March 22, 2020, 5 p.m. 22.6 ppb (21) 10.9 ppb (10) N/A 12.0 ppb (11) N/A N/A N/A 0.33 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
March 22, 2020, 4 p.m. 8.2 ppb (8) 5.4 ppb (5) N/A 3.0 ppb (3) N/A N/A N/A 0.25 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2020, 3 p.m. 7.3 ppb (7) 3.9 ppb (4) N/A 3.0 ppb (3) N/A N/A N/A 0.2 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2020, 2 p.m. 12.6 ppb (12) 7.6 ppb (7) N/A 5.0 ppb (5) N/A N/A N/A 0.24 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2020, 1 p.m. 7.8 ppb (7) 3.6 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.23 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 22, 2020, noon 15.8 ppb (15) 7.1 ppb (7) N/A 9.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2020, 11 a.m. 17.9 ppb (17) 7.1 ppb (7) N/A 11.0 ppb (10) N/A N/A N/A 0.26 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2020, 10 a.m. 15.4 ppb (14) 7.0 ppb (6) N/A 8.0 ppb (7) N/A N/A N/A 0.25 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2020, 9 a.m. 9.1 ppb (8) 3.2 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2020, 8 a.m. 8000.0 ppb (1991) 2.1 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.24 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2020, 7 a.m. 10890.0 ppb (2716) 5.1 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 22, 2020, 6 a.m. 10.0 ppb (9) 5.0 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 22, 2020, 5 a.m. 12.6 ppb (12) 4.7 ppb (4) N/A 8.0 ppb (7) N/A N/A N/A 0.3 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 22, 2020, 3 a.m. 24.5 ppb (23) 11.9 ppb (11) N/A 13.0 ppb (12) N/A N/A N/A 0.45 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2020, 2 a.m. 25.1 ppb (23) 10.1 ppb (9) N/A 15.0 ppb (14) N/A N/A N/A 0.5 ppb (6) N/A 4.0 μg/m3 (17) 17.0
 
March 22, 2020, 1 a.m. 10.9 ppb (10) 2.8 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 22, 2020, midnight 14930.0 ppb (3728) 5.4 ppb (5) N/A 10.0 ppb (9) N/A N/A N/A 0.27 ppb (3) N/A 7.9 μg/m3 (33) 33.0
 
March 21, 2020, 11 p.m. 28190.0 ppb (7052) 11.7 ppb (11) N/A 16.0 ppb (15) N/A N/A N/A 0.4 ppb (4) N/A 2.9 μg/m3 (12) 15.0
 
March 21, 2020, 10 p.m. 22920.0 ppb (5731) 12.5 ppb (12) N/A 10.0 ppb (9) N/A N/A N/A 0.49 ppb (5) N/A 2.0 μg/m3 (8) 12.0
 
March 21, 2020, 9 p.m. 25400.0 ppb (6352) 14.0 ppb (13) N/A 11.0 ppb (10) N/A N/A N/A 0.4 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
March 21, 2020, 8 p.m. 16.4 ppb (15) 10.5 ppb (10) N/A 6.0 ppb (6) N/A N/A N/A 0.35 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 21, 2020, 7 p.m. 15.1 ppb (14) 8.4 ppb (8) N/A 7.0 ppb (6) N/A N/A N/A 0.29 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 21, 2020, 6 p.m. 20.5 ppb (19) 13.8 ppb (13) N/A 7.0 ppb (6) N/A N/A N/A 0.39 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
March 21, 2020, 5 p.m. 24.3 ppb (23) 15.0 ppb (14) N/A 9.0 ppb (8) N/A N/A N/A 0.38 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
March 21, 2020, 4 p.m. 24.8 ppb (23) 16.9 ppb (16) N/A 8.0 ppb (7) N/A N/A N/A 0.4 ppb (4) N/A 3.0 μg/m3 (12) 16.0
 
March 21, 2020, 3 p.m. 29.6 ppb (27) 18.6 ppb (17) N/A 11.0 ppb (10) N/A N/A N/A 0.42 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
March 21, 2020, 2 p.m. 26.3 ppb (24) 16.1 ppb (15) N/A 10.0 ppb (9) N/A N/A N/A 0.38 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
March 21, 2020, 1 p.m. 30.1 ppb (28) 19.5 ppb (18) N/A 11.0 ppb (10) N/A N/A N/A 0.38 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 21, 2020, noon 30.8 ppb (29) 20.6 ppb (19) N/A 10.0 ppb (9) N/A N/A N/A 0.42 ppb (5) N/A 4.0 μg/m3 (17) 19.0
 
March 21, 2020, 11 a.m. 26.6 ppb (25) 16.8 ppb (16) N/A 10.0 ppb (9) N/A N/A N/A 0.35 ppb (4) N/A 2.0 μg/m3 (8) 16.0
 
March 21, 2020, 10 a.m. 18.1 ppb (17) 12.5 ppb (12) N/A 6.0 ppb (6) N/A N/A N/A 0.3 ppb (3) N/A 2.0 μg/m3 (8) 12.0
 
March 21, 2020, 9 a.m. 11.5 ppb (11) 6.5 ppb (6) N/A 5.0 ppb (5) N/A N/A N/A 0.24 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
March 21, 2020, 8 a.m. 7.4 ppb (7) 3.9 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.2 ppb (2) N/A 0.0 μg/m3 (0) 4.0